diff --git a/qse/doc/page/installation.md b/qse/doc/page/installation.md
index 63a3ef32..18f06a5a 100644
--- a/qse/doc/page/installation.md
+++ b/qse/doc/page/installation.md
@@ -158,6 +158,14 @@ available for the native makefile for Watcom C/C++ for OS/2 only.
 
 ### SCO UNIX System V/386 Release 3.2 ###
 
+- If /usr/include/netinet and /usr/include/net are missing,
+  check if there are /usr/include/sys/netinet and /usr/include/sys/net.
+  f they exists, you can make these symbolic links.
+
+    cd /usr/include
+    ln -sf sys/netinet netinet
+    ln -sf sys/net net
+
 - Specify GREP if configure fails to find an acceptable grep.
 - Build in the source tree. Building outside the source tree is likely to fail
   for dificiency of the bundled make utility.
@@ -165,6 +173,9 @@ available for the native makefile for Watcom C/C++ for OS/2 only.
 
     ./configure GREP=/bin/grep CFLAGS=""
 
+- Change RANLIB from "ranlib" to "true" in libltdl/libtool.
+
+    make
 
 ### More options ###
 
diff --git a/qse/lib/cmn/nwif-cfg.c b/qse/lib/cmn/nwif-cfg.c
index 93b708ad..2a4782ab 100644
--- a/qse/lib/cmn/nwif-cfg.c
+++ b/qse/lib/cmn/nwif-cfg.c
@@ -627,7 +627,10 @@ static int get_nwifcfg (int s, qse_nwifcfg_t* cfg, struct ifreq* ifr)
 		 * use the streams interface to get the hardware address. 
 		 */
 		int strfd;
-		qse_mchar_t devname[QSE_COUNTOF(ifr->ifr_name) + 5 + 1] = QSE_MT("/dev/");
+		/*qse_mchar_t devname[QSE_COUNTOF(ifr->ifr_name) + 5 + 1] = QSE_MT("/dev/");*/
+		qse_mchar_t devname[QSE_COUNTOF(ifr->ifr_name) + 5 + 1];
+
+		qse_mbscpy (devname, QSE_MT("/dev/"));
 		qse_mbscpy (&devname[5], ifr->ifr_name);
 		if ((strfd = QSE_OPEN (devname, O_RDONLY, 0)) >= 0)
 		{
diff --git a/qse/lib/cmn/pio.c b/qse/lib/cmn/pio.c
index 64d4219b..c0f888e0 100644
--- a/qse/lib/cmn/pio.c
+++ b/qse/lib/cmn/pio.c
@@ -425,8 +425,10 @@ static int close_unneeded_fds_using_proc (int* excepts, qse_size_t count)
 
 static int get_highest_fd (void)
 {
+#if defined(HAVE_GETRLIMIT)
 	struct rlimit rlim;
-	int fd;
+#endif
+	int fd = -1;
 	QSE_DIR* d;
 
 #if defined(F_MAXFD)
@@ -473,6 +475,7 @@ static int get_highest_fd (void)
 		return maxfd;
 	}
 
+#if defined(HAVE_GETRLIMIT)
 	if (QSE_GETRLIMIT (RLIMIT_NOFILE, &rlim) <= -1 ||
 	    rlim.rlim_max == RLIM_INFINITY) 
 	{
@@ -481,6 +484,9 @@ static int get_highest_fd (void)
 	#endif
 	}
 	else fd = rlim.rlim_max;
+#elif defined(HAVE_SYSCONF)
+	fd = sysconf (_SC_OPEN_MAX);
+#endif
 	if (fd <= -1) fd = 1024; /* fallback */
 
 	/* F_MAXFD is the highest fd. but RLIMIT_NOFILE and 
@@ -488,6 +494,7 @@ static int get_highest_fd (void)
 	 * descriptors. make adjustment */
 	if (fd > 0) fd--; 
 
+
 	return fd;
 }
 
@@ -659,7 +666,7 @@ int qse_pio_init (
 	qse_pio_t* pio, qse_mmgr_t* mmgr, const qse_char_t* cmd, 
 	qse_env_t* env, int flags)
 {
-	qse_pio_hnd_t handle[6] = 
+	qse_pio_hnd_t handle[6] /*= 
 	{ 
 		QSE_PIO_HND_NIL, 
 		QSE_PIO_HND_NIL,
@@ -667,14 +674,14 @@ int qse_pio_init (
 		QSE_PIO_HND_NIL,
 		QSE_PIO_HND_NIL,
 		QSE_PIO_HND_NIL
-	};
+	}*/;
 
-	qse_tio_t* tio[3] = 
+	qse_tio_t* tio[3] /*= 
 	{ 
 		QSE_NULL, 
 		QSE_NULL, 
 		QSE_NULL 
-	};
+	}*/;
 
 	int i, minidx = -1, maxidx = -1;
 
@@ -741,6 +748,17 @@ int qse_pio_init (
 	pio->mmgr = mmgr;
 	pio->flags = flags;
 
+	handle[0] = QSE_PIO_HND_NIL;
+	handle[1] = QSE_PIO_HND_NIL;
+	handle[2] = QSE_PIO_HND_NIL;
+	handle[3] = QSE_PIO_HND_NIL;
+	handle[4] = QSE_PIO_HND_NIL;
+	handle[5] = QSE_PIO_HND_NIL;
+
+	tio[0] = QSE_NULL;
+	tio[1] = QSE_NULL;
+	tio[2] = QSE_NULL;
+
 #if defined(_WIN32)
 	/* http://msdn.microsoft.com/en-us/library/ms682499(VS.85).aspx */
 
diff --git a/qse/lib/cmn/rbt.c b/qse/lib/cmn/rbt.c
index 6cdde47d..73b81113 100644
--- a/qse/lib/cmn/rbt.c
+++ b/qse/lib/cmn/rbt.c
@@ -612,7 +612,9 @@ pair_t* qse_rbt_cbsert (
 		{
 			/* back up the contents of the current pair 
 			 * in case it is reallocated */
-			pair_t tmp = *x_cur;	 
+			pair_t tmp;
+
+			tmp = *x_cur;	 
 
 			/* call the callback function to manipulate the pair */
 			x_new = cbserter (rbt, x_cur, kptr, klen, ctx);
diff --git a/qse/lib/cmn/rex.c b/qse/lib/cmn/rex.c
index 3c84c2a0..fc6def08 100644
--- a/qse/lib/cmn/rex.c
+++ b/qse/lib/cmn/rex.c
@@ -895,7 +895,7 @@ static qse_rex_node_t* comp_atom (comp_t* com)
 			default:
 				if (com->rex->option & QSE_REX_STRICT)
 				{
-					qse_char_t spc[] =
+					static qse_char_t spc[] =
         				{
 						QSE_T(')'),
 						QSE_T('?'),
@@ -905,10 +905,20 @@ static qse_rex_node_t* comp_atom (comp_t* com)
 						QSE_T('\0')
 					};
 
-					if (com->rex->option & QSE_REX_NOBOUND)
-						spc[4] = QSE_T('\0');
+					static qse_char_t nobound_spc[] =
+        				{
+						QSE_T(')'),
+						QSE_T('?'),
+						QSE_T('*'),
+						QSE_T('+'),
+						QSE_T('\0')
+					};
 
-					if (qse_strchr (spc, com->c.value) != QSE_NULL)
+					const qse_char_t* ptr;
+
+					ptr = (com->rex->option & QSE_REX_NOBOUND)? nobound_spc: spc;
+
+					if (qse_strchr (ptr, com->c.value))
 					{
 						com->rex->errnum = QSE_REX_ESPCAWP;
 						return QSE_NULL;
diff --git a/qse/lib/cmn/slmb.c b/qse/lib/cmn/slmb.c
index 2220fa01..5fe5d1dd 100644
--- a/qse/lib/cmn/slmb.c
+++ b/qse/lib/cmn/slmb.c
@@ -293,8 +293,19 @@ qse_size_t qse_slmblenmax (void)
 	 * is CP_UTF8(65001). you should use functions in utf8.c for utf8 
 	 * handling on windows. 2 is the maximum for DBCS encodings. */
 	return 2; 
-#else
+
+#elif defined(MB_CUR_MAX)
+
 	return MB_CUR_MAX;
+
+#elif (QSE_SIZEOF_WCHAR_T == QSE_SIZEOF_MCHAR_T)
+
+	/* no proper multibyte string support */
+	return 1;	
+
+#else
+	/* fallback max utf8 value */
+	return 6;
 #endif
 }