+### Check for X libraries
+# Check for the pt library (for SCO, needed for X)
+AC_CHECK_LIB(pt,ptsname,X_EXTRA_LIBS="-lpt $X_EXTRA_LIBS")
+# The real thing.
+AC_PATH_XTRA
+LIBS="$X_PRE_LIBS $LIBS $X_LIBS -lX11 $X_EXTRA_LIBS"
+# Since solaris X headers use int as implicit return type and modern
+# gcc's do not like that, let's use -isystem instead of -I.
+# We should test for gcc version and see whether it supports -isystem,
+# but since at least gcc 2.6.x supports it and it is still too old for
+# us, it seems we are safe.
+if test -n "$GXX" ; then
+ X_CFLAGS=`echo ${X_CFLAGS} | sed -e 's/-I/-isystem /'`
+fi
+CPPFLAGS="$CPPFLAGS $X_CFLAGS"
+
+## Check whether X is new enough to handle the input method stuff
+AC_CHECK_FUNCS(XOpenIM)
+