Consolidate versions involving win32 build.

Updated Pidgin.
gtk+ was not aligned with the version used by Pidgin.
MinGW now ships with newer gcc.

README.md

@@ -86,10 +86,10 @@ Dependencies:
 
 * pidgin (libpurple glib gtk)
 * pkg-config
-* cmake (3.8 or later)
+* cmake (3.8 or newer)
 * make
-* go (1.18 or later)
-* gcc (6.3.0 or later)
+* go (1.18 or newer)
+* gcc (9.2.0 or newer)
 * libgdk-pixbuf-2.0 (optional)
 * liboggfile (optional)
 
@@ -108,7 +108,7 @@ CMake will try to set-up a development environment automatically.
 Additional dependencies:
 
 * [go 1.18 or newer (32 bit)](https://go.dev/dl/go1.18.9.windows-386.msi)
-* [gcc (32 bit)](https://osdn.net/projects/mingw/)
+* [gcc 9.2.0 or newer (32 bit)](https://osdn.net/projects/mingw/)
 
 go and gcc must be in `%PATH%`.  
 

dependencies/win32/CMakeLists.txt

@@ -1,9 +1,10 @@
 cmake_minimum_required(VERSION 3.18) # for file(ARCHIVE_EXTRACT ...)
 
-set(GTK_BUNDLE_ZIP gtk+-bundle_2.24.10-20120208_win32.zip) # TODO: find correct version. 2.14.7 is too old, see https://developer.pidgin.im/ticket/15526
+# Pidgin 2.14.12 is shipped with gtk+ 2.16.6 and glib 2.28.8
+set(GTK_BUNDLE_ZIP gtk+-bundle_2.16.6-20100912_win32.zip)  # NOTE: This contains glib 2.24.2
 IF(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/${GTK_BUNDLE_ZIP})
     message(STATUS "Fetching ${GTK_BUNDLE_ZIP}...")
-    file(DOWNLOAD http://ftp.gnome.org/pub/gnome/binaries/win32/gtk+/2.24/${GTK_BUNDLE_ZIP} ${CMAKE_CURRENT_BINARY_DIR}/${GTK_BUNDLE_ZIP} SHOW_PROGRESS)
+    file(DOWNLOAD http://ftp.gnome.org/pub/gnome/binaries/win32/gtk+/2.16/${GTK_BUNDLE_ZIP} ${CMAKE_CURRENT_BINARY_DIR}/${GTK_BUNDLE_ZIP} SHOW_PROGRESS)
 ENDIF()
 IF(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/gtk/include/gtk-2.0/gtk/gtk.h)
     file(ARCHIVE_EXTRACT INPUT ${CMAKE_CURRENT_BINARY_DIR}/${GTK_BUNDLE_ZIP} DESTINATION ${CMAKE_CURRENT_BINARY_DIR}/gtk)
@@ -20,7 +21,7 @@ set(GTK_LIBRARY_DIRS
 find_file(GLIB_LIB "glib-2.0.lib" PATHS ${GTK_LIBRARY_DIRS})
 find_file(PIXBUF_LIB "gdk_pixbuf-2.0.lib" PATHS ${GTK_LIBRARY_DIRS})
 
-set(PIDGIN_VERSION 2.14.8)
+set(PIDGIN_VERSION 2.14.12)
 set(PIDGIN_DIRNAME pidgin-${PIDGIN_VERSION})
 set(PIDGIN_SOURCE_ZIP ${PIDGIN_DIRNAME}.tar.bz2)
 IF(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/${PIDGIN_SOURCE_ZIP})