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-rw-r--r--editor/pnmmontage.c1
-rw-r--r--editor/ppmcolormask.c1
2 files changed, 2 insertions, 0 deletions
diff --git a/editor/pnmmontage.c b/editor/pnmmontage.c
index a7b74510..4ccff497 100644
--- a/editor/pnmmontage.c
+++ b/editor/pnmmontage.c
@@ -10,6 +10,7 @@
  * implied warranty.
  */
 
+#define _BSD_SOURCE  /* Make sure strdup() is in <string.h> */
 #include <assert.h>
 #include <limits.h>
 #include <string.h>
diff --git a/editor/ppmcolormask.c b/editor/ppmcolormask.c
index eed64c19..0d7a214c 100644
--- a/editor/ppmcolormask.c
+++ b/editor/ppmcolormask.c
@@ -9,6 +9,7 @@
   Contributed to the public domain by its author.
 =========================================================================*/
 
+#define _BSD_SOURCE  /* Make sure strdup() is in <string.h> */
 #include <assert.h>
 #include <string.h>