# configure.ac

dnl Process this file with autoconf to produce a configure script.

dnl

dnl Minor upgrades (compatible ABI): increment the package version

dnl (third field in two places below) and set the PNGLIB_RELEASE

dnl variable.

dnl

dnl Major upgrades (incompatible ABI): increment the package major

dnl version (second field, or first if desired), set the minor

dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in

dnl Makefile.am to upgrade the package name.

dnl This is here to prevent earlier autoconf from being used, it

dnl should not be necessary to regenerate configure if the time

dnl stamps are correct

AC_PREREQ(2.59)

dnl Version number stuff here:

AC_INIT([libpng], [1.4.0], [png-mng-implement@lists.sourceforge.net])

AM_INIT_AUTOMAKE

dnl stop configure from automagically running automake

AM_MAINTAINER_MODE

PNGLIB_VERSION=1.4.0

PNGLIB_MAJOR=1

PNGLIB_MINOR=4

PNGLIB_RELEASE=0

dnl End of version number stuff

AC_CONFIG_SRCDIR([pngget.c])

AM_CONFIG_HEADER(config.h)

# Checks for programs.

AC_PROG_CC

AC_PROG_LD

AC_PROG_CPP

AC_CHECK_TOOL(SED, sed, :)

AC_LIBTOOL_WIN32_DLL

AC_PROG_INSTALL

AC_PROG_LN_S

AC_PROG_MAKE_SET

AC_PROG_LIBTOOL

# Checks for header files.

AC_HEADER_STDC

AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])

# Checks for typedefs, structures, and compiler characteristics.

AC_C_CONST

AC_TYPE_SIZE_T

AC_STRUCT_TM

# Checks for library functions.

AC_FUNC_STRTOD

AC_CHECK_FUNCS([memset], , AC_ERROR([memset not found in libc]))

AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_ERROR([cannot find pow])) )

AC_CHECK_LIB(z, zlibVersion, , AC_ERROR([zlib not installed]))

LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG

LIBPNG_DEFINES=$LIBPNG_DEFINES

AC_SUBST(LIBPNG_DEFINES)

AC_MSG_CHECKING([if libraries can be versioned])

GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`

if test "$GLD"; then

    have_ld_version_script=yes

    AC_MSG_RESULT(yes)

else

    have_ld_version_script=no

    AC_MSG_RESULT(no)

    AC_MSG_WARN(*** You have not enabled versioned symbols.)

fi

AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")

if test "$have_ld_version_script" = "yes"; then

    AC_MSG_CHECKING([for symbol prefix])

    SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \

                   | ${CPP-${CC-gcc} -E} - 2>&1 \

                   | ${EGREP-grep} "^PREFIX=" \

                   | ${SED-sed} "s:^PREFIX=::"`

    AC_SUBST(SYMBOL_PREFIX)

    AC_MSG_RESULT($SYMBOL_PREFIX)

fi

# Substitutions for .in files

AC_SUBST(PNGLIB_VERSION)

AC_SUBST(PNGLIB_MAJOR)

AC_SUBST(PNGLIB_MINOR)

AC_SUBST(PNGLIB_RELEASE)

# Additional arguments (and substitutions)

# Allow the pkg-config directory to be set

AC_ARG_WITH(pkgconfigdir,

	AC_HELP_STRING([--with-pkgconfigdir],

	[Use the specified pkgconfig dir (default is libdir/pkgconfig)]),

	[pkgconfigdir=${withval}],

	[pkgconfigdir='${libdir}/pkgconfig'])

AC_SUBST([pkgconfigdir])

AC_MSG_NOTICE([pkgconfig directory is ${pkgconfigdir}])

# Make the *-config binary config scripts optional

AC_ARG_WITH(binconfigs,

	AC_HELP_STRING([--with-binconfigs],

		[Generate shell libpng-config scripts as well as pkg-config data]

		[@<:@default=yes@:>@]),

	[if test "${withval}" = no; then

		binconfigs=

		AC_MSG_NOTICE([libpng-config scripts will not be built])

	else

		binconfigs='${binconfigs}'

	fi],

	[binconfigs='${binconfigs}'])

AC_SUBST([binconfigs])

# Config files, substituting as above

AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])

AC_CONFIG_FILES([libpng-config:libpng-config.in],

		[chmod +x libpng-config])

AC_OUTPUT