1 # generated automatically by aclocal 1.15.1 -*- Autoconf -*- 2 3 # Copyright (C) 1996-2017 Free Software Foundation, Inc. 4 5 # This file is free software; the Free Software Foundation 6 # gives unlimited permission to copy and/or distribute it, 7 # with or without modifications, as long as this notice is preserved. 8 9 # This program is distributed in the hope that it will be useful, 10 # but WITHOUT ANY WARRANTY, to the extent permitted by law; without 11 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A 12 # PARTICULAR PURPOSE. 13 14 m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])]) 15 m4_ifndef([AC_AUTOCONF_VERSION], 16 [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl 17 m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.69],, 18 [m4_warning([this file was generated for autoconf 2.69. 19 You have another version of autoconf. It may work, but is not guaranteed to. 20 If you have problems, you may need to regenerate the build system entirely. 21 To do so, use the procedure documented by the package, typically 'autoreconf'.])]) 22 23 # pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*- 24 # serial 11 (pkg-config-0.29.1) 25 26 dnl Copyright 2004 Scott James Remnant <scott (a] netsplit.com>. 27 dnl Copyright 2012-2015 Dan Nicholson <dbn.lists (a] gmail.com> 28 dnl 29 dnl This program is free software; you can redistribute it and/or modify 30 dnl it under the terms of the GNU General Public License as published by 31 dnl the Free Software Foundation; either version 2 of the License, or 32 dnl (at your option) any later version. 33 dnl 34 dnl This program is distributed in the hope that it will be useful, but 35 dnl WITHOUT ANY WARRANTY; without even the implied warranty of 36 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 37 dnl General Public License for more details. 38 dnl 39 dnl You should have received a copy of the GNU General Public License 40 dnl along with this program; if not, write to the Free Software 41 dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 42 dnl 02111-1307, USA. 43 dnl 44 dnl As a special exception to the GNU General Public License, if you 45 dnl distribute this file as part of a program that contains a 46 dnl configuration script generated by Autoconf, you may include it under 47 dnl the same distribution terms that you use for the rest of that 48 dnl program. 49 50 dnl PKG_PREREQ(MIN-VERSION) 51 dnl ----------------------- 52 dnl Since: 0.29 53 dnl 54 dnl Verify that the version of the pkg-config macros are at least 55 dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's 56 dnl installed version of pkg-config, this checks the developer's version 57 dnl of pkg.m4 when generating configure. 58 dnl 59 dnl To ensure that this macro is defined, also add: 60 dnl m4_ifndef([PKG_PREREQ], 61 dnl [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])]) 62 dnl 63 dnl See the "Since" comment for each macro you use to see what version 64 dnl of the macros you require. 65 m4_defun([PKG_PREREQ], 66 [m4_define([PKG_MACROS_VERSION], [0.29.1]) 67 m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1, 68 [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])]) 69 ])dnl PKG_PREREQ 70 71 dnl PKG_PROG_PKG_CONFIG([MIN-VERSION]) 72 dnl ---------------------------------- 73 dnl Since: 0.16 74 dnl 75 dnl Search for the pkg-config tool and set the PKG_CONFIG variable to 76 dnl first found in the path. Checks that the version of pkg-config found 77 dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is 78 dnl used since that's the first version where most current features of 79 dnl pkg-config existed. 80 AC_DEFUN([PKG_PROG_PKG_CONFIG], 81 [m4_pattern_forbid([^_?PKG_[A-Z_]+$]) 82 m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$]) 83 m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$]) 84 AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility]) 85 AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path]) 86 AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path]) 87 88 if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then 89 AC_PATH_TOOL([PKG_CONFIG], [pkg-config]) 90 fi 91 if test -n "$PKG_CONFIG"; then 92 _pkg_min_version=m4_default([$1], [0.9.0]) 93 AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version]) 94 if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then 95 AC_MSG_RESULT([yes]) 96 else 97 AC_MSG_RESULT([no]) 98 PKG_CONFIG="" 99 fi 100 fi[]dnl 101 ])dnl PKG_PROG_PKG_CONFIG 102 103 dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) 104 dnl ------------------------------------------------------------------- 105 dnl Since: 0.18 106 dnl 107 dnl Check to see whether a particular set of modules exists. Similar to 108 dnl PKG_CHECK_MODULES(), but does not set variables or print errors. 109 dnl 110 dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG]) 111 dnl only at the first occurence in configure.ac, so if the first place 112 dnl it's called might be skipped (such as if it is within an "if", you 113 dnl have to call PKG_CHECK_EXISTS manually 114 AC_DEFUN([PKG_CHECK_EXISTS], 115 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl 116 if test -n "$PKG_CONFIG" && \ 117 AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then 118 m4_default([$2], [:]) 119 m4_ifvaln([$3], [else 120 $3])dnl 121 fi]) 122 123 dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES]) 124 dnl --------------------------------------------- 125 dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting 126 dnl pkg_failed based on the result. 127 m4_define([_PKG_CONFIG], 128 [if test -n "$$1"; then 129 pkg_cv_[]$1="$$1" 130 elif test -n "$PKG_CONFIG"; then 131 PKG_CHECK_EXISTS([$3], 132 [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null` 133 test "x$?" != "x0" && pkg_failed=yes ], 134 [pkg_failed=yes]) 135 else 136 pkg_failed=untried 137 fi[]dnl 138 ])dnl _PKG_CONFIG 139 140 dnl _PKG_SHORT_ERRORS_SUPPORTED 141 dnl --------------------------- 142 dnl Internal check to see if pkg-config supports short errors. 143 AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED], 144 [AC_REQUIRE([PKG_PROG_PKG_CONFIG]) 145 if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then 146 _pkg_short_errors_supported=yes 147 else 148 _pkg_short_errors_supported=no 149 fi[]dnl 150 ])dnl _PKG_SHORT_ERRORS_SUPPORTED 151 152 153 dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND], 154 dnl [ACTION-IF-NOT-FOUND]) 155 dnl -------------------------------------------------------------- 156 dnl Since: 0.4.0 157 dnl 158 dnl Note that if there is a possibility the first call to 159 dnl PKG_CHECK_MODULES might not happen, you should be sure to include an 160 dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac 161 AC_DEFUN([PKG_CHECK_MODULES], 162 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl 163 AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl 164 AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl 165 166 pkg_failed=no 167 AC_MSG_CHECKING([for $1]) 168 169 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2]) 170 _PKG_CONFIG([$1][_LIBS], [libs], [$2]) 171 172 m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS 173 and $1[]_LIBS to avoid the need to call pkg-config. 174 See the pkg-config man page for more details.]) 175 176 if test $pkg_failed = yes; then 177 AC_MSG_RESULT([no]) 178 _PKG_SHORT_ERRORS_SUPPORTED 179 if test $_pkg_short_errors_supported = yes; then 180 $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1` 181 else 182 $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1` 183 fi 184 # Put the nasty error message in config.log where it belongs 185 echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD 186 187 m4_default([$4], [AC_MSG_ERROR( 188 [Package requirements ($2) were not met: 189 190 $$1_PKG_ERRORS 191 192 Consider adjusting the PKG_CONFIG_PATH environment variable if you 193 installed software in a non-standard prefix. 194 195 _PKG_TEXT])[]dnl 196 ]) 197 elif test $pkg_failed = untried; then 198 AC_MSG_RESULT([no]) 199 m4_default([$4], [AC_MSG_FAILURE( 200 [The pkg-config script could not be found or is too old. Make sure it 201 is in your PATH or set the PKG_CONFIG environment variable to the full 202 path to pkg-config. 203 204 _PKG_TEXT 205 206 To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl 207 ]) 208 else 209 $1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS 210 $1[]_LIBS=$pkg_cv_[]$1[]_LIBS 211 AC_MSG_RESULT([yes]) 212 $3 213 fi[]dnl 214 ])dnl PKG_CHECK_MODULES 215 216 217 dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND], 218 dnl [ACTION-IF-NOT-FOUND]) 219 dnl --------------------------------------------------------------------- 220 dnl Since: 0.29 221 dnl 222 dnl Checks for existence of MODULES and gathers its build flags with 223 dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags 224 dnl and VARIABLE-PREFIX_LIBS from --libs. 225 dnl 226 dnl Note that if there is a possibility the first call to 227 dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to 228 dnl include an explicit call to PKG_PROG_PKG_CONFIG in your 229 dnl configure.ac. 230 AC_DEFUN([PKG_CHECK_MODULES_STATIC], 231 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl 232 _save_PKG_CONFIG=$PKG_CONFIG 233 PKG_CONFIG="$PKG_CONFIG --static" 234 PKG_CHECK_MODULES($@) 235 PKG_CONFIG=$_save_PKG_CONFIG[]dnl 236 ])dnl PKG_CHECK_MODULES_STATIC 237 238 239 dnl PKG_INSTALLDIR([DIRECTORY]) 240 dnl ------------------------- 241 dnl Since: 0.27 242 dnl 243 dnl Substitutes the variable pkgconfigdir as the location where a module 244 dnl should install pkg-config .pc files. By default the directory is 245 dnl $libdir/pkgconfig, but the default can be changed by passing 246 dnl DIRECTORY. The user can override through the --with-pkgconfigdir 247 dnl parameter. 248 AC_DEFUN([PKG_INSTALLDIR], 249 [m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])]) 250 m4_pushdef([pkg_description], 251 [pkg-config installation directory @<:@]pkg_default[@:>@]) 252 AC_ARG_WITH([pkgconfigdir], 253 [AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],, 254 [with_pkgconfigdir=]pkg_default) 255 AC_SUBST([pkgconfigdir], [$with_pkgconfigdir]) 256 m4_popdef([pkg_default]) 257 m4_popdef([pkg_description]) 258 ])dnl PKG_INSTALLDIR 259 260 261 dnl PKG_NOARCH_INSTALLDIR([DIRECTORY]) 262 dnl -------------------------------- 263 dnl Since: 0.27 264 dnl 265 dnl Substitutes the variable noarch_pkgconfigdir as the location where a 266 dnl module should install arch-independent pkg-config .pc files. By 267 dnl default the directory is $datadir/pkgconfig, but the default can be 268 dnl changed by passing DIRECTORY. The user can override through the 269 dnl --with-noarch-pkgconfigdir parameter. 270 AC_DEFUN([PKG_NOARCH_INSTALLDIR], 271 [m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])]) 272 m4_pushdef([pkg_description], 273 [pkg-config arch-independent installation directory @<:@]pkg_default[@:>@]) 274 AC_ARG_WITH([noarch-pkgconfigdir], 275 [AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],, 276 [with_noarch_pkgconfigdir=]pkg_default) 277 AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir]) 278 m4_popdef([pkg_default]) 279 m4_popdef([pkg_description]) 280 ])dnl PKG_NOARCH_INSTALLDIR 281 282 283 dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE, 284 dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) 285 dnl ------------------------------------------- 286 dnl Since: 0.28 287 dnl 288 dnl Retrieves the value of the pkg-config variable for the given module. 289 AC_DEFUN([PKG_CHECK_VAR], 290 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl 291 AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl 292 293 _PKG_CONFIG([$1], [variable="][$3]["], [$2]) 294 AS_VAR_COPY([$1], [pkg_cv_][$1]) 295 296 AS_VAR_IF([$1], [""], [$5], [$4])dnl 297 ])dnl PKG_CHECK_VAR 298 299 dnl PKG_WITH_MODULES(VARIABLE-PREFIX, MODULES, 300 dnl [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND], 301 dnl [DESCRIPTION], [DEFAULT]) 302 dnl ------------------------------------------ 303 dnl 304 dnl Prepare a "--with-" configure option using the lowercase 305 dnl [VARIABLE-PREFIX] name, merging the behaviour of AC_ARG_WITH and 306 dnl PKG_CHECK_MODULES in a single macro. 307 AC_DEFUN([PKG_WITH_MODULES], 308 [ 309 m4_pushdef([with_arg], m4_tolower([$1])) 310 311 m4_pushdef([description], 312 [m4_default([$5], [build with ]with_arg[ support])]) 313 314 m4_pushdef([def_arg], [m4_default([$6], [auto])]) 315 m4_pushdef([def_action_if_found], [AS_TR_SH([with_]with_arg)=yes]) 316 m4_pushdef([def_action_if_not_found], [AS_TR_SH([with_]with_arg)=no]) 317 318 m4_case(def_arg, 319 [yes],[m4_pushdef([with_without], [--without-]with_arg)], 320 [m4_pushdef([with_without],[--with-]with_arg)]) 321 322 AC_ARG_WITH(with_arg, 323 AS_HELP_STRING(with_without, description[ @<:@default=]def_arg[@:>@]),, 324 [AS_TR_SH([with_]with_arg)=def_arg]) 325 326 AS_CASE([$AS_TR_SH([with_]with_arg)], 327 [yes],[PKG_CHECK_MODULES([$1],[$2],$3,$4)], 328 [auto],[PKG_CHECK_MODULES([$1],[$2], 329 [m4_n([def_action_if_found]) $3], 330 [m4_n([def_action_if_not_found]) $4])]) 331 332 m4_popdef([with_arg]) 333 m4_popdef([description]) 334 m4_popdef([def_arg]) 335 336 ])dnl PKG_WITH_MODULES 337 338 dnl PKG_HAVE_WITH_MODULES(VARIABLE-PREFIX, MODULES, 339 dnl [DESCRIPTION], [DEFAULT]) 340 dnl ----------------------------------------------- 341 dnl 342 dnl Convenience macro to trigger AM_CONDITIONAL after PKG_WITH_MODULES 343 dnl check._[VARIABLE-PREFIX] is exported as make variable. 344 AC_DEFUN([PKG_HAVE_WITH_MODULES], 345 [ 346 PKG_WITH_MODULES([$1],[$2],,,[$3],[$4]) 347 348 AM_CONDITIONAL([HAVE_][$1], 349 [test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"]) 350 ])dnl PKG_HAVE_WITH_MODULES 351 352 dnl PKG_HAVE_DEFINE_WITH_MODULES(VARIABLE-PREFIX, MODULES, 353 dnl [DESCRIPTION], [DEFAULT]) 354 dnl ------------------------------------------------------ 355 dnl 356 dnl Convenience macro to run AM_CONDITIONAL and AC_DEFINE after 357 dnl PKG_WITH_MODULES check. HAVE_[VARIABLE-PREFIX] is exported as make 358 dnl and preprocessor variable. 359 AC_DEFUN([PKG_HAVE_DEFINE_WITH_MODULES], 360 [ 361 PKG_HAVE_WITH_MODULES([$1],[$2],[$3],[$4]) 362 363 AS_IF([test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"], 364 [AC_DEFINE([HAVE_][$1], 1, [Enable ]m4_tolower([$1])[ support])]) 365 ])dnl PKG_HAVE_DEFINE_WITH_MODULES 366 367 # Copyright (C) 2002-2017 Free Software Foundation, Inc. 368 # 369 # This file is free software; the Free Software Foundation 370 # gives unlimited permission to copy and/or distribute it, 371 # with or without modifications, as long as this notice is preserved. 372 373 # AM_AUTOMAKE_VERSION(VERSION) 374 # ---------------------------- 375 # Automake X.Y traces this macro to ensure aclocal.m4 has been 376 # generated from the m4 files accompanying Automake X.Y. 377 # (This private macro should not be called outside this file.) 378 AC_DEFUN([AM_AUTOMAKE_VERSION], 379 [am__api_version='1.15' 380 dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to 381 dnl require some minimum version. Point them to the right macro. 382 m4_if([$1], [1.15.1], [], 383 [AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl 384 ]) 385 386 # _AM_AUTOCONF_VERSION(VERSION) 387 # ----------------------------- 388 # aclocal traces this macro to find the Autoconf version. 389 # This is a private macro too. Using m4_define simplifies 390 # the logic in aclocal, which can simply ignore this definition. 391 m4_define([_AM_AUTOCONF_VERSION], []) 392 393 # AM_SET_CURRENT_AUTOMAKE_VERSION 394 # ------------------------------- 395 # Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced. 396 # This function is AC_REQUIREd by AM_INIT_AUTOMAKE. 397 AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION], 398 [AM_AUTOMAKE_VERSION([1.15.1])dnl 399 m4_ifndef([AC_AUTOCONF_VERSION], 400 [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl 401 _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))]) 402 403 # Copyright (C) 2011-2017 Free Software Foundation, Inc. 404 # 405 # This file is free software; the Free Software Foundation 406 # gives unlimited permission to copy and/or distribute it, 407 # with or without modifications, as long as this notice is preserved. 408 409 # AM_PROG_AR([ACT-IF-FAIL]) 410 # ------------------------- 411 # Try to determine the archiver interface, and trigger the ar-lib wrapper 412 # if it is needed. If the detection of archiver interface fails, run 413 # ACT-IF-FAIL (default is to abort configure with a proper error message). 414 AC_DEFUN([AM_PROG_AR], 415 [AC_BEFORE([$0], [LT_INIT])dnl 416 AC_BEFORE([$0], [AC_PROG_LIBTOOL])dnl 417 AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl 418 AC_REQUIRE_AUX_FILE([ar-lib])dnl 419 AC_CHECK_TOOLS([AR], [ar lib "link -lib"], [false]) 420 : ${AR=ar} 421 422 AC_CACHE_CHECK([the archiver ($AR) interface], [am_cv_ar_interface], 423 [AC_LANG_PUSH([C]) 424 am_cv_ar_interface=ar 425 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int some_variable = 0;]])], 426 [am_ar_try='$AR cru libconftest.a conftest.$ac_objext >&AS_MESSAGE_LOG_FD' 427 AC_TRY_EVAL([am_ar_try]) 428 if test "$ac_status" -eq 0; then 429 am_cv_ar_interface=ar 430 else 431 am_ar_try='$AR -NOLOGO -OUT:conftest.lib conftest.$ac_objext >&AS_MESSAGE_LOG_FD' 432 AC_TRY_EVAL([am_ar_try]) 433 if test "$ac_status" -eq 0; then 434 am_cv_ar_interface=lib 435 else 436 am_cv_ar_interface=unknown 437 fi 438 fi 439 rm -f conftest.lib libconftest.a 440 ]) 441 AC_LANG_POP([C])]) 442 443 case $am_cv_ar_interface in 444 ar) 445 ;; 446 lib) 447 # Microsoft lib, so override with the ar-lib wrapper script. 448 # FIXME: It is wrong to rewrite AR. 449 # But if we don't then we get into trouble of one sort or another. 450 # A longer-term fix would be to have automake use am__AR in this case, 451 # and then we could set am__AR="$am_aux_dir/ar-lib \$(AR)" or something 452 # similar. 453 AR="$am_aux_dir/ar-lib $AR" 454 ;; 455 unknown) 456 m4_default([$1], 457 [AC_MSG_ERROR([could not determine $AR interface])]) 458 ;; 459 esac 460 AC_SUBST([AR])dnl 461 ]) 462 463 # AM_AUX_DIR_EXPAND -*- Autoconf -*- 464 465 # Copyright (C) 2001-2017 Free Software Foundation, Inc. 466 # 467 # This file is free software; the Free Software Foundation 468 # gives unlimited permission to copy and/or distribute it, 469 # with or without modifications, as long as this notice is preserved. 470 471 # For projects using AC_CONFIG_AUX_DIR([foo]), Autoconf sets 472 # $ac_aux_dir to '$srcdir/foo'. In other projects, it is set to 473 # '$srcdir', '$srcdir/..', or '$srcdir/../..'. 474 # 475 # Of course, Automake must honor this variable whenever it calls a 476 # tool from the auxiliary directory. The problem is that $srcdir (and 477 # therefore $ac_aux_dir as well) can be either absolute or relative, 478 # depending on how configure is run. This is pretty annoying, since 479 # it makes $ac_aux_dir quite unusable in subdirectories: in the top 480 # source directory, any form will work fine, but in subdirectories a 481 # relative path needs to be adjusted first. 482 # 483 # $ac_aux_dir/missing 484 # fails when called from a subdirectory if $ac_aux_dir is relative 485 # $top_srcdir/$ac_aux_dir/missing 486 # fails if $ac_aux_dir is absolute, 487 # fails when called from a subdirectory in a VPATH build with 488 # a relative $ac_aux_dir 489 # 490 # The reason of the latter failure is that $top_srcdir and $ac_aux_dir 491 # are both prefixed by $srcdir. 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