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-rw-r--r--converter/ppm/ppmtompeg/gethostname.c1
-rw-r--r--converter/ppm/ppmtompeg/mpeg.c1
-rw-r--r--converter/ppm/ppmtompeg/ppmtompeg.c1
3 files changed, 3 insertions, 0 deletions
diff --git a/converter/ppm/ppmtompeg/gethostname.c b/converter/ppm/ppmtompeg/gethostname.c
index 014b42e8..d20af17c 100644
--- a/converter/ppm/ppmtompeg/gethostname.c
+++ b/converter/ppm/ppmtompeg/gethostname.c
@@ -1,3 +1,4 @@
+#define _XOPEN_SOURCE 500  /* Make sure strdup() is in string.h */
 #define _BSD_SOURCE   /* Make sure strdup() is in string.h */
 
 #include <string.h>
diff --git a/converter/ppm/ppmtompeg/mpeg.c b/converter/ppm/ppmtompeg/mpeg.c
index 86ce7c7a..5cd7b099 100644
--- a/converter/ppm/ppmtompeg/mpeg.c
+++ b/converter/ppm/ppmtompeg/mpeg.c
@@ -30,6 +30,7 @@
  * HEADER FILES *
  *==============*/
 
+#define _XOPEN_SOURCE 500  /* Make sure strdup() is in string.h */
 #define _BSD_SOURCE   /* Make sure strdup() is in string.h */
 
 #include "all.h"
diff --git a/converter/ppm/ppmtompeg/ppmtompeg.c b/converter/ppm/ppmtompeg/ppmtompeg.c
index b8ef37f1..bc788552 100644
--- a/converter/ppm/ppmtompeg/ppmtompeg.c
+++ b/converter/ppm/ppmtompeg/ppmtompeg.c
@@ -30,6 +30,7 @@
  * HEADER FILES *
  *==============*/
 
+#define _XOPEN_SOURCE 500  /* Make sure strdup() is in string.h */
 #define _BSD_SOURCE   /* Make sure strdup() is in string.h */
 
 #include <assert.h>