Added patches for IRIX/gcc and OSF/1 4.x suggested by

Albert Chin-A-Young <china@thewrittenword.com>.

configure

@@ -1,5 +1,5 @@
 #!/bin/sh
-#	$Header: /cvs/maptools/cvsroot/libtiff/configure,v 1.1 1999-07-27 21:50:26 mike Exp $
+#	$Header: /cvs/maptools/cvsroot/libtiff/configure,v 1.2 1999-09-08 12:32:18 warmerda Exp $
 #
 # Tag Image File Format (TIFF) Software
 #
@@ -147,7 +147,7 @@ do
     -target|--target)		ac_prev=TARGET;;
     -target=*|--target=*)	TARGET="$ac_optarg" ;;
     -version|--version)
-	echo "This is TIFF configure $Revision: 1.1 $"
+	echo "This is TIFF configure $Revision: 1.2 $"
 	exit 0
 	;;
     -help|--help)		usage; exit 0;;
@@ -1100,7 +1100,13 @@ if [ "$DSO" = auto ]; then
 	if (findApp rld /lib:/usr/lib:$PATH) >/dev/null 2>&1; then
 	    DSOSUF=so
 	    DSOLD="${CCOMPILER} ${ENVOPTS}"
+            if [ $ISGCC = yes ]; then
+               LIBCOPTS="-fpic"
+               DSOOPTS='-shared -rdata_shared'
+            else
+               LIBCOPTS="-KPIC"
                DSOOPTS='-shared -rdata_shared -check_registry ${SRCDIR}/port/irix/so_locations -quickstart_info'
+            fi
 	    DSO=IRIX
 	    TIFFLIBREF='-L${DEPTH}/libtiff -rpath '${DIR_LIB}' -ltiff'
 	fi
@@ -1158,7 +1164,7 @@ if [ "$DSO" = auto ]; then
 	    DSO=LINUX
 	fi
 	;;
-    *-osf3*)
+    *-osf3*|*-osf4*)
 	DSOSUF=so
 	DSOOPTS='-shared'
 	DSO=OSF