Note that GCC 4.0 will optimize ceil (constant), we therefore
have to make the argument non-constant.

================================================================================
---
 configure.ac.footer |   20 ++++++++++++++++++++
 src/Makefile.in     |    3 ++-
 2 files changed, 22 insertions(+), 1 deletion(-)

Index: configure.ac.footer
===================================================================
--- configure.ac.footer.orig	2012-10-26 23:21:38.000000000 +0200
+++ configure.ac.footer	2013-04-16 12:21:01.350791832 +0200
@@ -112,6 +112,25 @@ fi
 AC_CHECK_FUNCS(vsyslog syslog)
 AC_FUNC_ALLOCA
 
+AC_MSG_CHECKING(for ceil)
+AC_TRY_LINK([#define __NO_MATH_INLINES 1
+             double d;],
+	    [d = ceil(1.0*d);],
+	    SYNLDFLAGS=""
+	    AC_MSG_RESULT(yes),
+	    SYNLDFLAGS=-lm
+	    AC_MSG_RESULT(no))
+
+if test "$SYNLDFLAGS" = "-lm" ; then
+    SAVE_LIBS="$LIBS"
+    AC_CHECK_LIB(m,
+                 ceil,
+		 ,
+		 echo "libmath.so is needed due the ceil function"
+		 exit 1)
+    LIBS="$SAVE_LIBS"
+fi
+
 case $with_curses in
 No|no|N|n) SHARED_LIBS=-lc ;;
 *)
@@ -142,6 +161,7 @@ AC_SUBST(ELISP)
 AC_SUBST(SHLIB)
 AC_SUBST(PICFLAGS)
 AC_SUBST(SOLDFLAGS)
+AC_SUBST(SYNLDFLAGS)
 AC_SUBST(LIBGPM_A)
 AC_SUBST(CURSES_OBJS)
 AC_SUBST(SHARED_LIBS)
Index: src/Makefile.in
===================================================================
--- src/Makefile.in.orig	2013-04-16 12:18:43.719054511 +0200
+++ src/Makefile.in	2013-04-16 12:18:43.762053491 +0200
@@ -166,7 +166,8 @@ lib/libgpm.a:	$(LOBJ)
 
 lib/libgpm.so.@abi_full@:	$(PICS)
 	$(CC) @SOLDFLAGS@libgpm.so.@abi_lev@ \
-	@LDFLAGS@ $(LDFLAGS) -o lib/libgpm.so.@abi_full@ $^ @LIBS@ @SHARED_LIBS@ $(LIBS)	
+	@LDFLAGS@ $(LDFLAGS) -o lib/libgpm.so.@abi_full@ $^ @LIBS@ @SHARED_LIBS@ @SYNLDFLAGS@ $(LIBS)
+
 lib/libgpm.so.@abi_lev@:	lib/libgpm.so.@abi_full@
 	$(LN_S) -f libgpm.so.@abi_full@ lib/libgpm.so.@abi_lev@
 # unneeded, isn't it?