added include guards - issue #59

xflouris · May 16, 2017 · eac52cf · eac52cf
1 parent 4cf496d
commit eac52cf
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/pll.h b/src/pll.h
@@ -19,6 +19,8 @@
     Schloss-Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany
 */
 
+#ifndef PLL_H
+#define PLL_H
 #include <assert.h>
 #include <math.h>
 #include <stdio.h>
@@ -1885,3 +1887,4 @@ PLL_EXPORT void pll_hardware_ignore();
 #ifdef __cplusplus
 } /* extern "C" */
 #endif
+#endif