--- src/configure.ac.orig	2003-04-16 22:59:56.000000000 +0900
+++ src/configure.ac	2015-08-22 02:03:41.246954000 +0900
@@ -8,6 +8,46 @@
 AC_PREREQ(2.52)
 AC_CONFIG_SRCDIR(src/gs.c)
 
+CFLAGS="${CFLAGS:=}"
+CPPFLAGS="${CPPFLAGS:=}"
+CXXFLAGS="${CXXFLAGS:=}"
+LDFLAGS="${LDFLAGS:=}"
+
+dnl --------------------------------------------------
+dnl Local utilities
+dnl --------------------------------------------------
+
+dnl GS_SPLIT_LIBS( LIBS, LINKLINE )
+dnl Split a unix-style link line into a list of 
+dnl bare library names. For example, the line
+dnl '-L/usr/X11R6/lib -lX11 -lXt' splits into
+dnl LIB='X11 Xt'
+dnl
+AC_DEFUN([GS_SPLIT_LIBS], [
+# the makefile wants a list of just the library names 
+for gs_item in $2; do
+  gs_stripped_item=`echo "$gs_item" | sed -e 's/^-l//'`
+  if test "x$gs_stripped_item" != "x$gs_item"; then
+    $1="$[$1] $gs_stripped_item"
+  fi
+done
+])
+
+dnl GS_SPLIT_LIBPATHS( LIBPATHS, LINKLINE )
+dnl Split a unix-style link line into a list of
+dnl bare search path entries. For example,
+dnl '-L/usr/X11R6/lib -lX11 -L/opt/lib -lXt'
+dnl splits to LIBPATHS='/usr/X11R6/lib /opt/lib'
+dnl
+AC_DEFUN([GS_SPLIT_LIBPATHS], [
+for gs_item in $2; do
+  gs_stripped_item=`echo "$gs_item" | sed -e 's/-L//'`
+  if test "x$gs_stripped_item" != "x$gs_item"; then
+    $1="$[$1] $gs_stripped_item"
+  fi
+done
+])
+
 dnl --------------------------------------------------  
 dnl Check for programs
 dnl --------------------------------------------------  
@@ -94,7 +134,14 @@
 dnl --------------------------------------------------
 
 AC_CHECK_LIB(m, cos)
-dnl AC_CHECK_LIB(pthread, pthread_create)
+SYNC="nosync"
+PTHREAD_LIBS=""
+AC_CHECK_LIB(pthread, pthread_create, [
+  SYNC=posync;
+  PTHREAD_LIBS="-lpthread"
+])
+AC_SUBST(SYNC)
+AC_SUBST(PTHREAD_LIBS)
 
 AC_MSG_CHECKING([for local jpeg library source])
 dnl At present, we give the local source priority over the shared
@@ -211,15 +258,68 @@
 AC_SUBST(STPLIB)
 AC_SUBST(STPDEVS)
 
+SOC_CFLAGS=""
+SOC_LIBS=""
+SOC_LOADER="dxmainc.c"
+
+AC_SUBST(SOC_CFLAGS)
+AC_SUBST(SOC_LIBS)
+AC_SUBST(SOC_LOADER)
+
 dnl optional X11 for display devices
 AC_PATH_XTRA
-if test x"$no_x" = x"yes"; then
-	AC_MSG_NOTICE([disabling X11 output devices])
-	X11DEVS=''
-else
-	X11DEVS='$(DD)x11.dev $(DD)x11alpha.dev $(DD)x11cmyk.dev $(DD)x11gray2.dev $(DD)x11gray4.dev $(DD)x11mono.dev'
+
+X_LDFLAGS=""
+X_CFLAGS=""
+X_DEVS=""
+X_LIBS=""
+
+if test x$with_x != xno; then
+	if test "$x_libraries" = "/usr/lib"; then
+		echo "Ignoring X library directory \"$x_libraries\" requested by configure."
+		x_libraries="NONE"
+	fi
+	if test ! "$x_libraries" = "NONE" -a ! "$x_libraries" = ""; then
+		X_LDFLAGS="-L$x_libraries"
+		if test "$uname" = "SunOS"; then
+			X_LDFLAGS="$X_LDFLAGS -R$x_libraries"
+		fi
+	fi
+
+	if test "$x_includes" = "/usr/include"; then
+		echo "Ignoring X include directory \"$x_includes\" requested by configure."
+		x_includes="NONE"
+	fi
+	if test ! "$x_includes" = "NONE" -a ! "$x_includes" = ""; then
+		X_CFLAGS="-I$x_includes"
+	fi
+
+	SAVELIBS="$LIBS"
+	SAVELDFLAGS="$LDFLAGS"
+	LDFLAGS="$LDFLAGS $X_LDFLAGS"
+
+	AC_CHECK_LIB(X11,XOpenDisplay)
+	AC_CHECK_LIB(Xext,XdbeQueryExtension)
+	AC_CHECK_LIB(Xt,XtAppCreateShell)
+
+	LDFLAGS="$SAVELDFLAGS"
+	LIBS="$SAVELIBS"
+
+	if test "$ac_cv_lib_Xt_XtAppCreateShell" = yes; then
+		X11DEVS="\$(DD)x11.dev \$(DD)x11alpha.dev \$(DD)x11cmyk.dev \$(DD)x11mono.dev \$(DD)x11_.dev \$(DD)x11alt_.dev \$(DD)x11cmyk2.dev \$(DD)x11cmyk4.dev \$(DD)x11cmyk8.dev \$(DD)x11rg16x.dev \$(DD)x11rg32x.dev \$(DD)x11gray2.dev \$(DD)x11gray4.dev"
+		X_DEVS=$X11DEVS
+		# the makefile wants a list of just the library names in X_LIBS
+		GS_SPLIT_LIBS([X_LIBS], 
+			[-lXt $X_PRE_LIBS -lXext -lX11 $X_EXTRA_LIBS])
+	fi
 fi
+
+AC_SUBST(X_LDFLAGS)
+AC_SUBST(X_CFLAGS)
+AC_SUBST(X_LIBS)
+AC_SUBST(X_DEVS)
 AC_SUBST(X11DEVS)
+AC_SUBST(XLIBS)
 
 dnl executible name
 AC_ARG_WITH(gs, AC_HELP_STRING([--with-gs=NAME],
@@ -236,6 +336,32 @@
 		fi])
 AC_SUBST(COMPILE_INITS)
 
+dnl Dynamic device support.
+DYNAMIC_CFLAGS=""
+DYNAMIC_DEVS=""
+DYNAMIC_FLAGS=""
+DYNAMIC_LDFLAGS=""
+DYNAMIC_LIBS=""
+INSTALL_SHARED=""
+
+AC_ARG_ENABLE([dynamic], AC_HELP_STRING([--enable-dynamic],
+    [Enable dynamically loaded drivers]),
+[
+	DYNAMIC_CFLAGS="-fPIC"
+	DYNAMIC_DEVS="\$(GLOBJDIR)/X11.so"
+	DYNAMIC_FLAGS="-DGS_DEVS_SHARED -DGS_DEVS_SHARED_DIR=\\\"\$(gssharedir)\\\""
+	DYNAMIC_LDFLAGS="-fPIC -shared"
+	DYNAMIC_LIBS=""
+	X_DEVS=""
+])
+
+AC_SUBST(DYNAMIC_CFLAGS)
+AC_SUBST(DYNAMIC_DEVS)
+AC_SUBST(DYNAMIC_FLAGS)
+AC_SUBST(DYNAMIC_LDFLAGS)
+AC_SUBST(DYNAMIC_LIBS)
+AC_SUBST(INSTALL_SHARED)
+
 dnl --------------------------------------------------
 dnl Check for library functions
 dnl --------------------------------------------------