Add zlib dependency to gio

Will be used by compression APIs

configure.in

@@ -457,6 +457,17 @@ fi
 AC_MSG_RESULT($enable_iconv_cache)
 
 
+dnl
+dnl zlib support
+dnl
+found_zlib=no
+AC_CHECK_LIB(z, inflate, [AC_CHECK_HEADER(zlib.h, found_zlib=yes)])
+
+if test "x$found_zlib" = "xno" ; then
+   AC_MSG_ERROR([*** Working zlib library and headers not found ***])
+fi
+ZLIB_LIBS='-lz'
+AC_SUBST(ZLIB_LIBS)
 dnl
 dnl gettext support
 dnl

gio-2.0.pc.in

@@ -10,4 +10,5 @@ Description: glib I/O library
 Version: @VERSION@
 Requires: glib-2.0,gobject-2.0,gmodule-no-export-2.0
 Libs: -L${libdir} -lgio-2.0
+Libs.private: @ZLIB_LIBS@
 Cflags: 

gio/Makefile.am

@@ -284,6 +284,7 @@ libgio_2_0_la_LIBADD = \
 	$(top_builddir)/gobject/libgobject-2.0.la 	\
 	$(top_builddir)/gmodule/libgmodule-2.0.la 	\
 	$(platform_libadd) 				\
+	$(ZLIB_LIBS)					\
 	$(SELINUX_LIBS) 				\
 	$(GLIB_LIBS) 					\
 	$(XATTR_LIBS) 					\