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-rw-r--r--src/PJ_unitconvert.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/PJ_unitconvert.c b/src/PJ_unitconvert.c
index a076b76c..5c25a16b 100644
--- a/src/PJ_unitconvert.c
+++ b/src/PJ_unitconvert.c
@@ -64,8 +64,12 @@ Last update: 2017-05-16
***********************************************************************/
#define PJ_LIB__
-#include <time.h>
+
#include <errno.h>
+#include <math.h>
+#include <string.h>
+#include <time.h>
+
#include "proj_internal.h"
#include "projects.h"