Bug #536299 Fix underlinking issue: Conditionally add -lX11 to gnome-utils

Follow-up to r17683. Patch by Andi5.
BP

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@17723 57a11ea4-9604-0410-9ed3-97b8803252fd

configure.in

@@ -217,6 +217,7 @@ AM_CONDITIONAL(GNUCASH_SEPARATE_BUILDDIR, test "x${srcdir}" != "x.")
 
 # These are unavailable on windows/mingw32
 AC_CHECK_HEADERS(X11/Xlib.h glob.h)
+AM_CONDITIONAL(HAVE_X11_XLIB_H, test "x$ac_cv_header_X11_Xlib_h" = "xyes")
 AC_CHECK_FUNCS(chown gethostname getppid getuid gettimeofday gmtime_r)
 AC_CHECK_FUNCS(gethostid link)
 

src/gnome-utils/Makefile.am

@@ -199,6 +199,10 @@ libgncmod_gnome_utils_la_LIBADD = \
   ${REGEX_LIBS} \
   ${LIBXML2_LIBS}
 
+if HAVE_X11_XLIB_H
+  libgncmod_gnome_utils_la_LIBADD += -lX11
+endif
+
 if BUILDING_FROM_SVN
 swig-gnome-utils.c: gnome-utils.i gnc-html.h \
                     ${top_srcdir}/src/base-typemaps.i