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configure: Remove redundant pkg-config code
This removes code that detects the pkg-config tool. We used this back in the days when we had dependencies. ;) It can always be brought back if we'll need it in the future. Note that we still deliver a .pc file for this library, and there is code in Makefile.am to install it. But this does not require the pkg-config tool; only consumers of the .pc file will need it. This can be verified by running `make install` (maybe after `mkdir /tmp/pre` and `./configure --prefix=/tmp/pre` and checking that the .pc file is installed correctly.
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configure.ac

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@@ -32,8 +32,6 @@ AM_INIT_AUTOMAKE([1.11.2 foreign subdir-objects])
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# Make the compilation flags quiet unless V=1 is used.
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m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
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PKG_PROG_PKG_CONFIG
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AC_PROG_CC
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if test x"$ac_cv_prog_cc_c89" = x"no"; then
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AC_MSG_ERROR([c89 compiler support required])
@@ -408,11 +406,6 @@ AC_SUBST(LIB_VERSION_CURRENT, _LIB_VERSION_CURRENT)
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AC_SUBST(LIB_VERSION_REVISION, _LIB_VERSION_REVISION)
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AC_SUBST(LIB_VERSION_AGE, _LIB_VERSION_AGE)
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# Make sure nothing new is exported so that we don't break the cache.
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PKGCONFIG_PATH_TEMP="$PKG_CONFIG_PATH"
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unset PKG_CONFIG_PATH
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PKG_CONFIG_PATH="$PKGCONFIG_PATH_TEMP"
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AC_OUTPUT
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echo

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