--- flow/gsl/gsldatahandle-mad.c	14 Aug 2002 13:21:15 -0000	1.1.1.2
+++ flow/gsl/gsldatahandle-mad.c	22 May 2003 18:14:13 -0000	1.5
@@ -23,6 +23,7 @@
 #include <assert.h>
 #include <stdio.h>
 #include <unistd.h>
+#undef environ
 #include <sys/mman.h>
 #include <unistd.h>
 #include <sys/types.h>
