Link with libm to fix unresolved symbols when linked with as-needed
and add a soname to the standalone math library
R bug: https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=14953

Patch by Sebastien Fabbro
Adapted to R-3.0.0 by Denis Dupeyron

--- src/nmath/standalone/Makefile.in.orig	2013-04-04 14:39:15.777544946 -0600
+++ src/nmath/standalone/Makefile.in	2013-04-04 14:40:51.256153179 -0600
@@ -64,7 +64,8 @@
 Rexeclibdir_LTLIBRARIES = $(libRmath_la)
 libRmath_la_SOURCES = $(SOURCES)
 libRmath_la_OBJECTS = $(OBJECTS:.o=.lo)
-libRmath_la_LDFLAGS =
+libRmath_la_LDFLAGS = -Wl,-soname=libRmath.so
+libRmath_la_LIBADD = $(LIBM)
 
 CLEANFILES = Makedeps *.d *.o *.lo test $(SOURCES)
 DISTCLEANFILES = Makefile $(Rexeclibdir_LIBRARIES) $(Rexeclibdir_LTLIBRARIES)
@@ -117,7 +118,7 @@
 
 ## under peculiar circumstances, $(LIBM) here helps.
 $(libRmath_la): $(libRmath_la_OBJECTS)
-	$(DYLIB_LINK) -o $@ $(libRmath_la_LDFLAGS) $(libRmath_la_OBJECTS) $(LIBM)
+	$(DYLIB_LINK) $(libRmath_la_LDFLAGS) $(libRmath_la_OBJECTS) $(libRmath_la_LIBADD) -o $@
 
 test: $(srcdir)/test.c
 	$(CC) -o $@ $(ALL_CPPFLAGS) $(ALL_CFLAGS) $(srcdir)/test.c \