We need to include alloca.h on OpenSolaris.

configure.in

@@ -844,6 +844,7 @@ dnl  check required libraries and header files
 dnl ===========================================
 
 AC_HEADER_STDBOOL
+AC_FUNC_ALLOCA
 
 dnl libraries needed on some platforms but not on others
 dnl ====================================================

src/libstrongswan/chunk.h

@@ -26,6 +26,9 @@
 #include <string.h>
 #include <stdarg.h>
 #include <sys/types.h>
+#ifdef HAVE_ALLOCA_H
+#include <alloca.h>
+#endif
 
 typedef struct chunk_t chunk_t;