diff --git a/ext/math/Makefile.in b/ext/math/Makefile.in
index 9b47c2957..69a7635ad 100755
--- a/ext/math/Makefile.in
+++ b/ext/math/Makefile.in
@@ -4,9 +4,10 @@
 # $Revision$
 # $Date$
 #
-
 LIB = @buildlib@/libctmath.a
 
+all: $(LIB)
+
 .SUFFIXES :
 .SUFFIXES : .f .d .o .cpp