diff --git a/moo/configure b/moo/configure
index 0a3f114..e947686 100755
--- a/moo/configure
+++ b/moo/configure
@@ -19110,6 +19110,52 @@ fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for strftime %z" >&5
+$as_echo_n "checking for strftime %z... " >&6; }
+if test "$cross_compiling" = yes; then :
+
+	 		 	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: unknown" >&5
+$as_echo "unknown" >&6; }
+
+$as_echo "#define HAVE_STRFTIME_SMALL_Z 1" >>confdefs.h
+
+
+
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <string.h>
+	 #if defined(HAVE_SYS_TIME_H)
+	 #include <sys/time.h>
+	 #endif
+	 #if defined(HAVE_TIME_H)
+	 #include <time.h>
+	 #endif
+	int main ()
+	{
+		char buf[100];
+		time_t t = 0;
+		strftime (buf, sizeof(buf), "%z", gmtime(&t));
+		return strcmp(buf, "%z") == 0? 1: 0;
+	}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+
+	 	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+
+$as_echo "#define HAVE_STRFTIME_SMALL_Z 1" >>confdefs.h
+
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+
 # The cast to long int works around a bug in the HP C Compiler
 # version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
 # declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.
diff --git a/moo/configure.ac b/moo/configure.ac
index 9295ed8..1c6048f 100644
--- a/moo/configure.ac
+++ b/moo/configure.ac
@@ -213,6 +213,34 @@ AC_TRY_LINK(
 	[AC_MSG_RESULT(no)]
 )
 
+AC_MSG_CHECKING([for strftime %z])
+AC_TRY_RUN(
+	[#include <string.h>
+	 #if defined(HAVE_SYS_TIME_H)
+	 #include <sys/time.h>
+	 #endif
+	 #if defined(HAVE_TIME_H)
+	 #include <time.h>
+	 #endif
+	int main ()
+	{
+		char buf[100];
+		time_t t = 0;
+		strftime (buf, sizeof(buf), "%z", gmtime(&t));
+		return strcmp(buf, "%z") == 0? 1: 0;
+	}],
+	[
+	 	AC_MSG_RESULT(yes)
+		AC_DEFINE([HAVE_STRFTIME_SMALL_Z], [1], [strftime supports %z])
+	],
+	[AC_MSG_RESULT(no)],
+	[
+	 	dnl cross-compiling, assume yes
+	 	AC_MSG_RESULT(unknown)
+		AC_DEFINE([HAVE_STRFTIME_SMALL_Z], [1], [strftime supports %z])
+	]
+)
+
 dnl check the size of primitive data types
 AC_CHECK_SIZEOF(char,,[[]])
 AC_CHECK_SIZEOF(short,,[[]])
diff --git a/moo/kernel/Mill.moo b/moo/kernel/Mill.moo
index 88e3b65..d6e0da6 100644
--- a/moo/kernel/Mill.moo
+++ b/moo/kernel/Mill.moo
@@ -85,16 +85,6 @@ class MyObject(Object)
 		] on: Exception do: [:ex | ('Exception caught - ' & ex asString) dump ].*)
 
 		ffi := FFI new: '/lib64/libc.so.6'.
-		(*
-		(ffi isError) 
-			ifTrue: [System logNl: 'cannot open libc.so' ]
-			ifFalse: [
-				(ffi call: #getpid  signature: ')i' arguments: nil) dump.
-				(ffi call: #printf signature: 's|iis)i' arguments: #(S'A=>%d B=>%d Hello, world %s\n' 1 2 'fly away')) dump.
-				(ffi call: #printf signature: 's|iis)i' arguments: #(S'A=>%d B=>%d Hello, world %s\n' 1 2 'jump down')) dump.
-				ffi close.
-			].
-		*)
 		if (ffi isError)
 		{
 			System logNl: 'cannot open libc.so'
diff --git a/moo/lib/main.c b/moo/lib/main.c
index a78b35b..6c7b611 100644
--- a/moo/lib/main.c
+++ b/moo/lib/main.c
@@ -660,10 +660,10 @@ if (mask & MOO_LOG_GC) return; /* don't show gc logs */
 	}
 #else
 	tmp = localtime_r (&now, &tm);
-	#if defined(__sun) && defined(__SVR4) /* TODO: better check on support of %z */
-	tslen = strftime (ts, sizeof(ts), "%Y-%m-%d %H:%M:%S %Z ", tmp); 
-	#else
+	#if defined(HAVE_STRFTIME_SMALL_Z)
 	tslen = strftime (ts, sizeof(ts), "%Y-%m-%d %H:%M:%S %z ", tmp);
+	#else
+	tslen = strftime (ts, sizeof(ts), "%Y-%m-%d %H:%M:%S %Z ", tmp); 
 	#endif
 	if (tslen == 0) 
 	{
diff --git a/moo/lib/moo-cfg.h.in b/moo/lib/moo-cfg.h.in
index e009376..a5917c2 100644
--- a/moo/lib/moo-cfg.h.in
+++ b/moo/lib/moo-cfg.h.in
@@ -217,6 +217,9 @@
 /* Define to 1 if you have the <stdlib.h> header file. */
 #undef HAVE_STDLIB_H
 
+/* strftime supports %z */
+#undef HAVE_STRFTIME_SMALL_Z
+
 /* Define to 1 if you have the <strings.h> header file. */
 #undef HAVE_STRINGS_H