ac_caolan_check_package

Provides --with-PACKAGE, --with-PACKAGE-include and --with-PACKAGE-libdir options to configure. Supports the now standard --with-PACKAGE=DIR approach where the package's include dir and lib dir are underneath DIR, but also allows the include and lib directories to be specified seperately

adds the extra -Ipath to CFLAGS if needed adds extra -Lpath to LD_FLAGS if needed searches for the FUNCTION in the LIBRARY with AC_CHECK_LIBRARY and thus adds the lib to LIBS

defines HAVE_PKG_PACKAGE if it is found, (where PACKAGE in the HAVE_PKG_PACKAGE is replaced with the actual first parameter passed) note that autoheader will complain of not having the HAVE_PKG_PACKAGE and you will have to add it to acconfig.h manually

AC_DEFUN([AC_caolan_CHECK_PACKAGE],
[

AC_ARG_WITH($1,
[  --with-$1[=DIR]      root directory of $1 installation],
with_$1=$withval
if test "${with_$1}" != yes; then
        $1_include="$withval/include"
        $1_libdir="$withval/lib"
fi
)

AC_ARG_WITH($1-include,
[  --with-$1-include=DIR        specify exact include dir for $1 headers],
$1_include="$withval")

AC_ARG_WITH($1-libdir,
[  --with-$1-libdir=DIR        specify exact library dir for $1 library
  --without-$1        disables $1 usage completely],
$1_libdir="$withval")

if test "${with_$1}" != no ; then
        OLD_LIBS=$LIBS
        OLD_LDFLAGS=$LDFLAGS
        OLD_CFLAGS=$CFLAGS
        OLD_CPPFLAGS=$CPPFLAGS

        if test "${$1_libdir}" ; then
                LDFLAGS="$LDFLAGS -L${$1_libdir}"
        fi
        if test "${$1_include}" ; then
                CPPFLAGS="$CPPFLAGS -I${$1_include}"
                CFLAGS="$CFLAGS -I${$1_include}"
        fi

        no_good=no
        AC_CHECK_LIB($3,$2,,no_good=yes)
        AC_CHECK_HEADER($4,,no_good=yes)
        if test "$no_good" = yes; then
dnl     broken
                ifelse([$6], , , [$6])

                LIBS=$OLD_LIBS
                LDFLAGS=$OLD_LDFLAGS
                CPPFLAGS=$OLD_CPPFLAGS
                CFLAGS=$OLD_CFLAGS
        else
dnl     fixed
                ifelse([$5], , , [$5])

                AC_DEFINE(HAVE_PKG_$1)
        fi

fi

])

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