Document MinGW64 autotools build

Update INSTALL.Win32 to describe compiling with GCC with
MinGW64 + MSYS2 Environment using autotools (see bug 10053)

diff --git a/INSTALL.Win32 b/INSTALL.Win32
index 3b71427200fd9f6be1e17cd7b81de8dc746e68d2..abd3601d503f9100b8b05a50e33171ee9fff794f 100644 (file)
--- a/INSTALL.Win32
+++ b/INSTALL.Win32
@@ -107,3 +107,17 @@ Creating the Installer
        - Copy the 3 dll-files from there to the DLL folder of the NSIS installation
        - Check whether the file locations/paths in settings.nsh match your setup.
        - Right-click on lyx.nsi and click "Compile NSIS Script".
+
+
+Compiling with GCC with MinGW64 + MSYS2 Environment using autotools
+===================================================================
+1      Install MSYS2, MINGW64, Qt5+
+       https://wiki.qt.io/MSYS2
+2      Install bc (Bench calculater), which autotools uses for some reason to compile LyX
+       pacman -S bc
+3      Run the standard autotools install (Adapt paths and arguments accordingly)
+       ./autogen.sh
+        ./configure --without-x --enable-qt5 --disable-debug --enable-optimization --prefix=/mingw64
+       make
+       make install
+