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-rw-r--r--editor/pnmshear.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/editor/pnmshear.c b/editor/pnmshear.c
index 7bf983cc..5ed6c5c5 100644
--- a/editor/pnmshear.c
+++ b/editor/pnmshear.c
@@ -12,6 +12,7 @@
 
 #define _XOPEN_SOURCE   /* get M_PI in math.h */
 
+#include <assert.h>
 #include <math.h>
 #include <string.h>