configure: Fix build on debian by avoiding bashisms in the test command.

configure.ac

@@ -33,13 +33,13 @@ AM_CONDITIONAL(HAVE_RSVG_CONVERT, test -n "$RSVG_CONVERT")
 
 AC_ARG_ENABLE(setuid-install, [  --enable-setuid-install],,
 	      enable_setuid_install=yes)
-AM_CONDITIONAL(ENABLE_SETUID_INSTALL, test x$enable_setuid_install == xyes)
+AM_CONDITIONAL(ENABLE_SETUID_INSTALL, test x$enable_setuid_install = xyes)
 
 
 AC_ARG_ENABLE(xserver-launcher, [  --enable-xserver-launcher],,
 	      enable_xserver_launcher=yes)
-AM_CONDITIONAL(ENABLE_XSERVER_LAUNCHER, test x$enable_xserver_launcher == xyes)
-if test x$enable_xserver_launcher == xyes; then
+AM_CONDITIONAL(ENABLE_XSERVER_LAUNCHER, test x$enable_xserver_launcher = xyes)
+if test x$enable_xserver_launcher = xyes; then
   PKG_CHECK_MODULES([XSERVER_LAUNCHER], xcb xcb-xfixes)
   AC_DEFINE([BUILD_XSERVER_LAUNCHER], [1], [Build the X server launcher])
 
@@ -52,8 +52,8 @@ fi
 
 AC_ARG_ENABLE(x11-compositor, [  --enable-x11-compositor],,
 	      enable_x11_compositor=yes)
-AM_CONDITIONAL(ENABLE_X11_COMPOSITOR, test x$enable_x11_compositor == xyes)
-if test x$enable_x11_compositor == xyes; then
+AM_CONDITIONAL(ENABLE_X11_COMPOSITOR, test x$enable_x11_compositor = xyes)
+if test x$enable_x11_compositor = xyes; then
   PKG_CHECK_MODULES([XCB], xcb)
   xcb_save_LIBS=$LIBS
   xcb_save_CFLAGS=$CFLAGS
@@ -70,8 +70,8 @@ fi
 
 AC_ARG_ENABLE(drm-compositor, [  --enable-drm-compositor],,
 	      enable_drm_compositor=yes)
-AM_CONDITIONAL(ENABLE_DRM_COMPOSITOR, test x$enable_drm_compositor == xyes)
-if test x$enable_drm_compositor == xyes; then
+AM_CONDITIONAL(ENABLE_DRM_COMPOSITOR, test x$enable_drm_compositor = xyes)
+if test x$enable_drm_compositor = xyes; then
   AC_DEFINE([BUILD_DRM_COMPOSITOR], [1], [Build the DRM compositor])
   PKG_CHECK_MODULES(DRM_COMPOSITOR, [libudev >= 136 libdrm >= 2.4.23 gbm])
 fi
@@ -79,8 +79,8 @@ fi
 
 AC_ARG_ENABLE(openwfd-compositor, [  --enable-openwfd-compositor],,
 	      enable_openwfd_compositor=no)
-AM_CONDITIONAL(ENABLE_OPENWFD_COMPOSITOR, test x$enable_openwfd_compositor == xyes)
-if test x$enable_openwfd_compositor == xyes; then
+AM_CONDITIONAL(ENABLE_OPENWFD_COMPOSITOR, test x$enable_openwfd_compositor = xyes)
+if test x$enable_openwfd_compositor = xyes; then
   AC_DEFINE([BUILD_OPENWFD_COMPOSITOR], [1], [Build the OpenWF compositor])
   PKG_CHECK_MODULES(OPENWFD_COMPOSITOR, [openwfd gbm])
 fi
@@ -89,8 +89,8 @@ fi
 AC_ARG_ENABLE(wayland-compositor, [  --enable-wayland-compositor],,
 	      enable_wayland_compositor=yes)
 AM_CONDITIONAL(ENABLE_WAYLAND_COMPOSITOR,
-	       test x$enable_wayland_compositor == xyes)
-if test x$enable_wayland_compositor == xyes; then
+	       test x$enable_wayland_compositor = xyes)
+if test x$enable_wayland_compositor = xyes; then
   AC_DEFINE([BUILD_WAYLAND_COMPOSITOR], [1],
 	    [Build the Wayland (nested) compositor])
   PKG_CHECK_MODULES(WAYLAND_COMPOSITOR, [wayland-client wayland-egl])
@@ -100,21 +100,21 @@ AC_ARG_WITH(cairo-glesv2, AS_HELP_STRING([--with-cairo-glesv2],
               [Use GLESv2 cairo instead of full GL]),
               [cairo_modules="cairo-glesv2"],
               [cairo_modules="cairo-gl"])
-if test x$cairo_modules == xcairo-glesv2; then
+if test x$cairo_modules = xcairo-glesv2; then
   AC_DEFINE([USE_CAIRO_GLESV2], [1], [Use the GLESv2 GL cairo backend])
 fi
 
 AC_ARG_ENABLE(simple-clients, [  --enable-simple-clients],, enable_simple_clients=yes)
-AM_CONDITIONAL(BUILD_SIMPLE_CLIENTS, test x$enable_simple_clients == xyes)
-if test x$enable_simple_clients == xyes; then
+AM_CONDITIONAL(BUILD_SIMPLE_CLIENTS, test x$enable_simple_clients = xyes)
+if test x$enable_simple_clients = xyes; then
   AC_DEFINE([BUILD_SIMPLE_CLIENTS], [1], [Build the Wayland simple clients])
   PKG_CHECK_MODULES(SIMPLE_CLIENT,
                     [egl >= 7.10 glesv2 wayland-client wayland-egl])
 fi
 
 AC_ARG_ENABLE(clients, [  --enable-clients],, enable_clients=yes)
-AM_CONDITIONAL(BUILD_CLIENTS, test x$enable_clients == xyes)
-if test x$enable_clients == xyes; then
+AM_CONDITIONAL(BUILD_CLIENTS, test x$enable_clients = xyes)
+if test x$enable_clients = xyes; then
   AC_DEFINE([BUILD_CLIENTS], [1], [Build the Wayland clients])
 
   PKG_CHECK_MODULES(CLIENT, [wayland-client wayland-egl egl >= 7.10 cairo >= 1.10.0 gdk-pixbuf-2.0 glib-2.0 gobject-2.0 gio-2.0 xkbcommon libpng])
@@ -134,7 +134,7 @@ if test x$enable_clients == xyes; then
   CLIENT_CFLAGS="$CLIENT_CFLAGS $WEBP_CFLAGS"
 
   AC_CHECK_LIB([jpeg], [jpeg_CreateDecompress], have_jpeglib=yes)
-  if test x$have_jpeglib == xyes; then
+  if test x$have_jpeglib = xyes; then
     CLIENT_LIBS="$CLIENT_LIBS -ljpeg"
   else
     AC_ERROR([libjpeg not found])
@@ -145,14 +145,14 @@ fi
 AM_CONDITIONAL(HAVE_POPPLER, test "x$have_poppler" = "xyes")
 
 AM_CONDITIONAL(BUILD_FULL_GL_CLIENTS,
-	       test x$cairo_modules == "xcairo-gl" -a "x$have_cairo_egl" = "xyes")
+	       test x$cairo_modules = "xcairo-gl" -a "x$have_cairo_egl" = "xyes")
 
 AM_CONDITIONAL(ENABLE_DESKTOP_SHELL, true)
 
 AC_ARG_ENABLE(tablet-shell, [  --enable-tablet-shell],,
 	      enable_tablet_shell=yes)
 AM_CONDITIONAL(ENABLE_TABLET_SHELL,
-	       test x$enable_tablet_shell == xyes)
+	       test x$enable_tablet_shell = xyes)
 
 AC_ARG_ENABLE(tests,
 	      AS_HELP_STRING([--disable-tests],
@@ -176,7 +176,7 @@ AC_CONFIG_FILES([Makefile
 		 tests/Makefile])
 AC_OUTPUT
 
-if test "x$enable_setuid_install" == xyes; then
+if test "x$enable_setuid_install" = xyes; then
 AC_MSG_WARN([
 
  *** You've enabled the setuid install hook.  Weston is still a