Add --with-pkglibdir option to set the installation directory of freeswitch.pc.

Default behaviour is unchanged.

Packagers should use this option to install freeswitch.pc into
the system's main pkg-config directory (e.g. /usr/lib/pkgconfig).
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>
Tested-by: Stefan Knoblich <s.knoblich@axsentis.de>

Makefile.am

@@ -356,7 +356,7 @@ scripts/fsxs: scripts/fsxs.in
 ## misc
 ##
 
-pkgconfigdir = $(libdir)/pkgconfig
+pkgconfigdir   = @pkgconfigdir@
 pkgconfig_DATA = build/freeswitch.pc
 
 $(switch_builddir)/modules.conf:

configure.in

@@ -93,6 +93,17 @@ AC_SUBST(libdir)
 AC_SUBST(bindir)
 AC_SUBST(includedir)
 
+AC_ARG_WITH([pkgconfigdir],
+	[AS_HELP_STRING([--with-pkgconfigdir=DIR], [Installation directory for pkgconfig file (default: \${libdir}/pkgconfig)])],
+	[case "${withval}" in
+	 yes|no) AC_MSG_ERROR([Invalid value ${withval} for option --with-pkgconfigdir]) ;;
+	 *) pkgconfigdir="${withval}" ;;
+	 esac
+	],
+	[pkgconfigdir="${libdir}/pkgconfig"]
+)
+AC_SUBST([pkgconfigdir])
+
 #Set default language
 AC_LANG_C
 # Checks for programs.