Commit 58889f88 authored by Philip Carns's avatar Philip Carns

simplify zlib m4 check

- zlib is mandatory now
parent ff60981b
......@@ -1460,52 +1460,6 @@ fi
} # ac_fn_c_try_compile
# ac_fn_c_try_link LINENO
# -----------------------
# Try to link conftest.$ac_ext, and return whether this succeeded.
ac_fn_c_try_link ()
{
as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
rm -f conftest.$ac_objext conftest$ac_exeext
if { { ac_try="$ac_link"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
$as_echo "$ac_try_echo"; } >&5
(eval "$ac_link") 2>conftest.err
ac_status=$?
if test -s conftest.err; then
grep -v '^ *+' conftest.err >conftest.er1
cat conftest.er1 >&5
mv -f conftest.er1 conftest.err
fi
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext && {
test "$cross_compiling" = yes ||
test -x conftest$ac_exeext
}; then :
ac_retval=0
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
ac_retval=1
fi
# Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
# created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
# interfere with the next link command; also delete a directory that is
# left behind by Apple's compiler. We do this before executing the actions.
rm -rf conftest.dSYM conftest_ipa8_conftest.oo
eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
as_fn_set_status $ac_retval
} # ac_fn_c_try_link
# ac_fn_c_try_cpp LINENO
# ----------------------
# Try to preprocess conftest.$ac_ext, and return whether this succeeded.
......@@ -1703,6 +1657,52 @@ $as_echo "$ac_res" >&6; }
} # ac_fn_c_check_header_compile
# ac_fn_c_try_link LINENO
# -----------------------
# Try to link conftest.$ac_ext, and return whether this succeeded.
ac_fn_c_try_link ()
{
as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
rm -f conftest.$ac_objext conftest$ac_exeext
if { { ac_try="$ac_link"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
$as_echo "$ac_try_echo"; } >&5
(eval "$ac_link") 2>conftest.err
ac_status=$?
if test -s conftest.err; then
grep -v '^ *+' conftest.err >conftest.er1
cat conftest.er1 >&5
mv -f conftest.er1 conftest.err
fi
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext && {
test "$cross_compiling" = yes ||
test -x conftest$ac_exeext
}; then :
ac_retval=0
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
ac_retval=1
fi
# Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
# created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
# interfere with the next link command; also delete a directory that is
# left behind by Apple's compiler. We do this before executing the actions.
rm -rf conftest.dSYM conftest_ipa8_conftest.oo
eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
as_fn_set_status $ac_retval
} # ac_fn_c_try_link
# ac_fn_c_check_type LINENO TYPE VAR INCLUDES
# -------------------------------------------
# Tests whether TYPE exists after having included INCLUDES, setting cache
......@@ -3455,109 +3455,38 @@ fi
done
#
# Handle user hints
#
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if zlib is wanted" >&5
$as_echo_n "checking if zlib is wanted... " >&6; }
# Check whether --with-zlib was given.
if test "${with_zlib+set}" = set; then :
withval=$with_zlib; if test "$withval" != no ; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
$as_echo "yes" >&6; }
if test -d "$withval"
then
ZLIB_HOME="$withval"
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
__CP_ZLIB_LINK_FLAGS="-L${ZLIB_HOME}/lib"
__CP_ZLIB_INCLUDE_FLAGS="-I${ZLIB_HOME}/include"
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Sorry, $withval does not exist, checking usual places" >&5
$as_echo "$as_me: WARNING: Sorry, $withval does not exist, checking usual places" >&2;}
fi
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
$as_echo "no" >&6; }
as_fn_error $? "zlib is required" "$LINENO" 5
fi
fi
#
# Locate zlib, if wanted
#
if test -n "${ZLIB_HOME}"
then
ZLIB_OLD_LDFLAGS=$LDFLAGS
ZLIB_OLD_CPPFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
ac_ext=c
ac_cpp='$CPP $CPPFLAGS'
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
ac_compiler_gnu=$ac_cv_c_compiler_gnu
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inflateEnd in -lz" >&5
$as_echo_n "checking for inflateEnd in -lz... " >&6; }
if ${ac_cv_lib_z_inflateEnd+:} false; then :
$as_echo_n "(cached) " >&6
else
ac_check_lib_save_LIBS=$LIBS
LIBS="-lz $LIBS"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
/* Override any GCC internal prototype to avoid an error.
Use char because int might match the return type of a GCC
builtin and then its argument prototype would still apply. */
#ifdef __cplusplus
extern "C"
#endif
char inflateEnd ();
int
main ()
{
return inflateEnd ();
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
ac_cv_lib_z_inflateEnd=yes
else
ac_cv_lib_z_inflateEnd=no
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
LIBS=$ac_check_lib_save_LIBS
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_z_inflateEnd" >&5
$as_echo "$ac_cv_lib_z_inflateEnd" >&6; }
if test "x$ac_cv_lib_z_inflateEnd" = xyes; then :
zlib_cv_libz=yes
else
zlib_cv_libz=no
fi
ac_fn_c_check_header_mongrel "$LINENO" "zlib.h" "ac_cv_header_zlib_h" "$ac_includes_default"
ac_fn_c_check_header_mongrel "$LINENO" "zlib.h" "ac_cv_header_zlib_h" "$ac_includes_default"
if test "x$ac_cv_header_zlib_h" = xyes; then :
zlib_cv_zlib_h=yes
else
zlib_cv_zlib_h=no
as_fn_error $? "z.h not found" "$LINENO" 5
fi
ac_ext=c
ac_cpp='$CPP $CPPFLAGS'
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
ac_compiler_gnu=$ac_cv_c_compiler_gnu
if test "$zlib_cv_libz" = "yes" -a "$zlib_cv_zlib_h" = "yes"
then
#
# If both library and header were found, use them
#
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inflateEnd in -lz" >&5
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inflateEnd in -lz" >&5
$as_echo_n "checking for inflateEnd in -lz... " >&6; }
if ${ac_cv_lib_z_inflateEnd+:} false; then :
$as_echo_n "(cached) " >&6
......@@ -3600,27 +3529,10 @@ _ACEOF
LIBS="-lz $LIBS"
else
as_fn_error $? "libz not found" "$LINENO" 5
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking zlib in ${ZLIB_HOME}" >&5
$as_echo_n "checking zlib in ${ZLIB_HOME}... " >&6; }
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok" >&5
$as_echo "ok" >&6; }
__CP_ZLIB_LINK_FLAGS="-L${ZLIB_HOME}/lib"
__CP_ZLIB_INCLUDE_FLAGS="-I${ZLIB_HOME}/include"
else
#
# If either header or library was not found, revert and bomb
#
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking zlib in ${ZLIB_HOME}" >&5
$as_echo_n "checking zlib in ${ZLIB_HOME}... " >&6; }
LDFLAGS="$ZLIB_OLD_LDFLAGS"
CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: failed" >&5
$as_echo "failed" >&6; }
as_fn_error $? "either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib" "$LINENO" 5
fi
fi
......
......@@ -1445,52 +1445,6 @@ fi
} # ac_fn_c_try_compile
# ac_fn_c_try_link LINENO
# -----------------------
# Try to link conftest.$ac_ext, and return whether this succeeded.
ac_fn_c_try_link ()
{
as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
rm -f conftest.$ac_objext conftest$ac_exeext
if { { ac_try="$ac_link"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
$as_echo "$ac_try_echo"; } >&5
(eval "$ac_link") 2>conftest.err
ac_status=$?
if test -s conftest.err; then
grep -v '^ *+' conftest.err >conftest.er1
cat conftest.er1 >&5
mv -f conftest.er1 conftest.err
fi
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext && {
test "$cross_compiling" = yes ||
test -x conftest$ac_exeext
}; then :
ac_retval=0
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
ac_retval=1
fi
# Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
# created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
# interfere with the next link command; also delete a directory that is
# left behind by Apple's compiler. We do this before executing the actions.
rm -rf conftest.dSYM conftest_ipa8_conftest.oo
eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
as_fn_set_status $ac_retval
} # ac_fn_c_try_link
# ac_fn_c_try_cpp LINENO
# ----------------------
# Try to preprocess conftest.$ac_ext, and return whether this succeeded.
......@@ -1688,6 +1642,52 @@ $as_echo "$ac_res" >&6; }
} # ac_fn_c_check_header_compile
# ac_fn_c_try_link LINENO
# -----------------------
# Try to link conftest.$ac_ext, and return whether this succeeded.
ac_fn_c_try_link ()
{
as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
rm -f conftest.$ac_objext conftest$ac_exeext
if { { ac_try="$ac_link"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
$as_echo "$ac_try_echo"; } >&5
(eval "$ac_link") 2>conftest.err
ac_status=$?
if test -s conftest.err; then
grep -v '^ *+' conftest.err >conftest.er1
cat conftest.er1 >&5
mv -f conftest.er1 conftest.err
fi
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext && {
test "$cross_compiling" = yes ||
test -x conftest$ac_exeext
}; then :
ac_retval=0
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
ac_retval=1
fi
# Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
# created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
# interfere with the next link command; also delete a directory that is
# left behind by Apple's compiler. We do this before executing the actions.
rm -rf conftest.dSYM conftest_ipa8_conftest.oo
eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
as_fn_set_status $ac_retval
} # ac_fn_c_try_link
# ac_fn_c_check_func LINENO FUNC VAR
# ----------------------------------
# Tests whether FUNC exists, setting the cache variable VAR accordingly
......@@ -3420,109 +3420,38 @@ fi
done
#
# Handle user hints
#
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if zlib is wanted" >&5
$as_echo_n "checking if zlib is wanted... " >&6; }
# Check whether --with-zlib was given.
if test "${with_zlib+set}" = set; then :
withval=$with_zlib; if test "$withval" != no ; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
$as_echo "yes" >&6; }
if test -d "$withval"
then
ZLIB_HOME="$withval"
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
__CP_ZLIB_LINK_FLAGS="-L${ZLIB_HOME}/lib"
__CP_ZLIB_INCLUDE_FLAGS="-I${ZLIB_HOME}/include"
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Sorry, $withval does not exist, checking usual places" >&5
$as_echo "$as_me: WARNING: Sorry, $withval does not exist, checking usual places" >&2;}
fi
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
$as_echo "no" >&6; }
as_fn_error $? "zlib is required" "$LINENO" 5
fi
fi
#
# Locate zlib, if wanted
#
if test -n "${ZLIB_HOME}"
then
ZLIB_OLD_LDFLAGS=$LDFLAGS
ZLIB_OLD_CPPFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
ac_ext=c
ac_cpp='$CPP $CPPFLAGS'
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
ac_compiler_gnu=$ac_cv_c_compiler_gnu
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inflateEnd in -lz" >&5
$as_echo_n "checking for inflateEnd in -lz... " >&6; }
if ${ac_cv_lib_z_inflateEnd+:} false; then :
$as_echo_n "(cached) " >&6
else
ac_check_lib_save_LIBS=$LIBS
LIBS="-lz $LIBS"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
/* Override any GCC internal prototype to avoid an error.
Use char because int might match the return type of a GCC
builtin and then its argument prototype would still apply. */
#ifdef __cplusplus
extern "C"
#endif
char inflateEnd ();
int
main ()
{
return inflateEnd ();
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
ac_cv_lib_z_inflateEnd=yes
else
ac_cv_lib_z_inflateEnd=no
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
LIBS=$ac_check_lib_save_LIBS
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_z_inflateEnd" >&5
$as_echo "$ac_cv_lib_z_inflateEnd" >&6; }
if test "x$ac_cv_lib_z_inflateEnd" = xyes; then :
zlib_cv_libz=yes
else
zlib_cv_libz=no
fi
ac_fn_c_check_header_mongrel "$LINENO" "zlib.h" "ac_cv_header_zlib_h" "$ac_includes_default"
ac_fn_c_check_header_mongrel "$LINENO" "zlib.h" "ac_cv_header_zlib_h" "$ac_includes_default"
if test "x$ac_cv_header_zlib_h" = xyes; then :
zlib_cv_zlib_h=yes
else
zlib_cv_zlib_h=no
as_fn_error $? "z.h not found" "$LINENO" 5
fi
ac_ext=c
ac_cpp='$CPP $CPPFLAGS'
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
ac_compiler_gnu=$ac_cv_c_compiler_gnu
if test "$zlib_cv_libz" = "yes" -a "$zlib_cv_zlib_h" = "yes"
then
#
# If both library and header were found, use them
#
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inflateEnd in -lz" >&5
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for inflateEnd in -lz" >&5
$as_echo_n "checking for inflateEnd in -lz... " >&6; }
if ${ac_cv_lib_z_inflateEnd+:} false; then :
$as_echo_n "(cached) " >&6
......@@ -3565,27 +3494,10 @@ _ACEOF
LIBS="-lz $LIBS"
else
as_fn_error $? "libz not found" "$LINENO" 5
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking zlib in ${ZLIB_HOME}" >&5
$as_echo_n "checking zlib in ${ZLIB_HOME}... " >&6; }
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok" >&5
$as_echo "ok" >&6; }
__CP_ZLIB_LINK_FLAGS="-L${ZLIB_HOME}/lib"
__CP_ZLIB_INCLUDE_FLAGS="-I${ZLIB_HOME}/include"
else
#
# If either header or library was not found, revert and bomb
#
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking zlib in ${ZLIB_HOME}" >&5
$as_echo_n "checking zlib in ${ZLIB_HOME}... " >&6; }
LDFLAGS="$ZLIB_OLD_LDFLAGS"
CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: failed" >&5
$as_echo "failed" >&6; }
as_fn_error $? "either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib" "$LINENO" 5
fi
fi
#
......
dnl @synopsis CHECK_ZLIB()
dnl
dnl This macro searches for an installed zlib library. If nothing was
dnl specified when calling configure, it searches first in /usr/local
dnl and then in /usr. If the --with-zlib=DIR is specified, it will try
dnl to find it in DIR/include/zlib.h and DIR/lib/libz.a. If
dnl --without-zlib is specified, the library is not searched at all.
dnl
dnl If either the header file (zlib.h) or the library (libz) is not
dnl found, the configuration exits on error, asking for a valid zlib
dnl installation directory or --without-zlib.
dnl
dnl The macro defines the symbol HAVE_LIBZ if the library is found. You
dnl should use autoheader to include a definition for this symbol in a
dnl config.h file. Sample usage in a C/C++ source is as follows:
dnl
dnl #ifdef HAVE_LIBZ
dnl #include <zlib.h>
dnl #endif /* HAVE_LIBZ */
dnl
dnl @category InstalledPackages
dnl @author Loic Dachary <loic@senga.org>
dnl @version 2004-09-20
dnl @license GPLWithACException
AC_DEFUN([CHECK_ZLIB],
[
#
# Handle user hints
#
[AC_MSG_CHECKING(if zlib is wanted)
AC_ARG_WITH(zlib,
[ --with-zlib=DIR root directory path of zlib installation [defaults to
/usr/local or /usr if not found in /usr/local]
--without-zlib to disable zlib usage completely],
[if test "$withval" != no ; then
AC_MSG_RESULT(yes)
if test -d "$withval"
then
ZLIB_HOME="$withval"
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
__CP_ZLIB_LINK_FLAGS="-L${ZLIB_HOME}/lib"
__CP_ZLIB_INCLUDE_FLAGS="-I${ZLIB_HOME}/include"
else
AC_MSG_WARN([Sorry, $withval does not exist, checking usual places])
fi
else
AC_MSG_RESULT(no)
AC_MSG_ERROR(zlib is required)
fi])
#
# Locate zlib, if wanted
#
if test -n "${ZLIB_HOME}"
then
ZLIB_OLD_LDFLAGS=$LDFLAGS
ZLIB_OLD_CPPFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
AC_LANG_SAVE
AC_LANG_C
AC_CHECK_LIB(z, inflateEnd, [zlib_cv_libz=yes], [zlib_cv_libz=no])
AC_CHECK_HEADER(zlib.h, [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no])
AC_LANG_RESTORE
if test "$zlib_cv_libz" = "yes" -a "$zlib_cv_zlib_h" = "yes"
then
#
# If both library and header were found, use them
#
AC_CHECK_LIB(z, inflateEnd)
AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
AC_MSG_RESULT(ok)
__CP_ZLIB_LINK_FLAGS="-L${ZLIB_HOME}/lib"
__CP_ZLIB_INCLUDE_FLAGS="-I${ZLIB_HOME}/include"
else
#
# If either header or library was not found, revert and bomb
#
AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
LDFLAGS="$ZLIB_OLD_LDFLAGS"
CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
AC_MSG_RESULT(failed)
AC_MSG_ERROR(either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib)
fi
fi
AC_CHECK_HEADER(zlib.h, [],[AC_MSG_ERROR(z.h not found)])
AC_CHECK_LIB(z, inflateEnd, [],[AC_MSG_ERROR(libz not found)])
])
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