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-rw-r--r--converter/other/cameratopam/foveon.c2
-rw-r--r--converter/other/pamtosvg/vector.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/converter/other/cameratopam/foveon.c b/converter/other/cameratopam/foveon.c
index a3e5449a..992f3883 100644
--- a/converter/other/cameratopam/foveon.c
+++ b/converter/other/cameratopam/foveon.c
@@ -1,6 +1,6 @@
 /* This code is licensed to the public by its copyright owners under GPL. */
 
-#define _XOPEN_SOURCE   /* get M_PI */
+#define _XOPEN_SOURCE 500  /* get M_PI in math.h */
 
 #include <stdio.h>
 #include <assert.h>
diff --git a/converter/other/pamtosvg/vector.c b/converter/other/pamtosvg/vector.c
index 0a5ef3a9..771e5f27 100644
--- a/converter/other/pamtosvg/vector.c
+++ b/converter/other/pamtosvg/vector.c
@@ -1,6 +1,6 @@
 /* vector.c: vector/point operations. */
 
-#define _XOPEN_SOURCE   /* Make sure M_PI is in <math.h> */
+#define _XOPEN_SOURCE 500  /* get M_PI in math.h */
 #include <math.h>
 #include <errno.h>
 #include <assert.h>