Fix: wxWidgets 3.0 back-compat

Fix #1599

deps/CMakeLists.txt

@@ -33,6 +33,7 @@ endif ()
 
 set(DESTDIR "${CMAKE_CURRENT_BINARY_DIR}/destdir" CACHE PATH "Destination directory")
 option(DEP_DEBUG "Build debug variants (only applicable on Windows)" ON)
+option(DEP_WX_STABLE "Build against wxWidgets stable 3.0 as opposed to default 3.1 (Linux only)" OFF)
 
 message(STATUS "Slic3r deps DESTDIR: ${DESTDIR}")
 message(STATUS "Slic3r deps debug build: ${DEP_DEBUG}")

deps/deps-linux.cmake

@@ -88,16 +88,24 @@ ExternalProject_Add(dep_libcurl
     INSTALL_COMMAND make install "DESTDIR=${DESTDIR}"
 )
 
+if (DEP_WX_STABLE)
+    set(DEP_WX_URL "https://github.com/wxWidgets/wxWidgets/releases/download/v3.0.4/wxWidgets-3.0.4.tar.bz2")
+    set(DEP_WX_HASH "SHA256=96157f988d261b7368e5340afa1a0cad943768f35929c22841f62c25b17bf7f0")
+else ()
+    set(DEP_WX_URL "https://github.com/wxWidgets/wxWidgets/releases/download/v3.1.1/wxWidgets-3.1.1.tar.bz2")
+    set(DEP_WX_HASH "SHA256=c925dfe17e8f8b09eb7ea9bfdcfcc13696a3e14e92750effd839f5e10726159e")
+endif()
+
 ExternalProject_Add(dep_wxwidgets
     EXCLUDE_FROM_ALL 1
-    URL "https://github.com/wxWidgets/wxWidgets/releases/download/v3.1.1/wxWidgets-3.1.1.tar.bz2"
-    URL_HASH SHA256=c925dfe17e8f8b09eb7ea9bfdcfcc13696a3e14e92750effd839f5e10726159e
+    URL "${DEP_WX_URL}"
+    URL_HASH "${DEP_WX_HASH}"
     BUILD_IN_SOURCE 1
     PATCH_COMMAND "${CMAKE_COMMAND}" -E copy "${CMAKE_CURRENT_SOURCE_DIR}/wxwidgets-pngprefix.h" src/png/pngprefix.h
     CONFIGURE_COMMAND ./configure
         "--prefix=${DESTDIR}/usr/local"
         --disable-shared
-       --with-gtk=2
+        --with-gtk=2
         --with-opengl
         --enable-unicode
         --enable-graphics_ctx