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pkg-config workaround for missing PKG_CHECK_VAR #313

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pkg-config workaround for missing PKG_CHECK_VAR #313

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18 changes: 18 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,24 @@ AC_PROG_CC_C99
AC_C_CONST
AC_PROG_LIBTOOL

# backwards compat with older pkg-config
# - pull in AC_DEFUN from pkg.m4
m4_ifndef([PKG_CHECK_VAR], [
# PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# -------------------------------------------
# Retrieves the value of the pkg-config variable for the given module.
AC_DEFUN([PKG_CHECK_VAR],
[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl

_PKG_CONFIG([$1], [variable="][$3]["], [$2])
AS_VAR_COPY([$1], [pkg_cv_][$1])

AS_VAR_IF([$1], [""], [$5], [$4])dnl
])# PKG_CHECK_VAR
])

case $host_os in
*linux*)
linux=yes
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