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-rw-r--r--src/geodesic.c5
-rw-r--r--src/proj_internal.h4
2 files changed, 5 insertions, 4 deletions
diff --git a/src/geodesic.c b/src/geodesic.c
index 49c9823e..dcdd4d77 100644
--- a/src/geodesic.c
+++ b/src/geodesic.c
@@ -27,8 +27,13 @@
#include <math.h>
#if !defined(HAVE_C99_MATH)
+#if defined(PROJ_LIB)
+/* PROJ requires C99 so HAVE_C99_MATH is implicit */
+#define HAVE_C99_MATH 1
+#else
#define HAVE_C99_MATH 0
#endif
+#endif
#if !defined(__cplusplus)
#define nullptr 0
diff --git a/src/proj_internal.h b/src/proj_internal.h
index 4a126e98..6d978b35 100644
--- a/src/proj_internal.h
+++ b/src/proj_internal.h
@@ -76,10 +76,6 @@
#define STATIC_ASSERT(COND) ((void)sizeof(char[(COND) ? 1 : -1]))
-#if !defined(HAVE_C99_MATH)
-#define HAVE_C99_MATH 0
-#endif
-
#ifndef PJ_TODEG
#define PJ_TODEG(rad) ((rad)*180.0/M_PI)
#endif