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-rw-r--r--src/os_msdos.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/os_msdos.h b/src/os_msdos.h
index 49420a8959..95578bc1f1 100644
--- a/src/os_msdos.h
+++ b/src/os_msdos.h
@@ -35,6 +35,7 @@
#define HAVE_MEMSET
#define HAVE_QSORT
#define HAVE_ST_MODE /* have stat.st_mode */
+#define HAVE_MATH_H
#if defined(__DATE__) && defined(__TIME__)
# define HAVE_DATE_TIME
#endif