Add pkg-config support to the GMP source tree.

gmp_add_pc.sh

#!/bin/sh
#Add pkg-config support to GMP
#http://gmplib.org/list-archives/gmp-discuss/2013-May/005329.html

echo "Creating gmp.pc.in..."

echo """prefix=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
includedir=@includedir@

Name: gmp 
Description: GNU Multiple Precision Arithmetic Library
URL: http://gmplib.org
Version: @PACKAGE_VERSION@
Libs: -L\${libdir} -lgmp
Cflags: -I\${includedir}""" > gmp.pc.in

echo "Patching Makefile.am..."

sed -i "100ipkgconfigdir = \$(libdir)/pkgconfig\\
pkgconfig_DATA = gmp.pc" Makefile.am

echo "Patching configure.ac..."
sed -i "3648iAC_CONFIG_FILES([gmp.pc])" configure.ac

echo """Running automake...

"""
automake --add-missing
autoreconf

echo """

Completed. Run './configure' followed by 'make' and 'sudo make install'
gmp.pc will be added to /usr/local/lib/pkgconfig

Run 'export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig' to set environment (should be default)

To check version after install: pkg-config --modversion gmp
To include during compilation: gcc program.c \$(pkg-config --cflags --libs gmp)

"""

Need to also add aclocal && libtoolize --force before autoreconf, in order to avoid errors like "You should recreate aclocal.m4 with macros from libtool...", caused by a libtool version mismatch.