--- chicken_old.h       Thu Apr 18 09:34:26 2013
+++ chicken.h   Thu Apr 18 09:36:22 2013
@@ -87,7 +87,7 @@
 # define C_NONUNIX
 #endif

-#if defined(__sun__) && defined(__svr4__)
+#if defined(__sun__) && defined(__svr4__) || defined(__SUNPRO_C)
 # define C_SOLARIS
 #endif

@@ -918,6 +918,9 @@
 # ifdef __linux__
 extern double round(double);
 extern double trunc(double);
+# elif defined (__SunOS_5_9)
+static inline double trunc(double x) { return (x >= 0 ? floor(x) : floor(x) + 1); }
+static inline double round(double x) { return (x - floor(x) >= 0.5 ? floor(x) + 1 : floor(x)); }
 # endif
 #else
 /* provide this file and define C_PROVIDE_LIBC_STUBS if you want to use