[GNC] fail to compile aqbanking, as required GMP on MINGW32

[Hai Liang Wang]

hi, folks

Run src/gnucash-on-windows.git; TARGET=gnucash-stable jhbuild -f jhbuildrc
build
When the job is compiling aqbanking, it breaks.

Trace as below, full log is attached.

checking typemaker2 binary... $(gwenhywfar_bindir)/typemaker2
checking xmlmerge... C:/gcdev64/gnucash/stable/inst/bin/xmlmerge
checking for __gmpz_init in -lgmp... no
*checking for gmp.h... yes*
*configure: error: GMP is required, see http://swox.com/gmp
<http://swox.com/gmp>*
[1m*** Error during phase configure of aqbanking: ########## Error running
/c/gcdev64/gnucash/stable/src/aqbanking-6.5.12beta/configure --prefix
/c/gcdev64/gnucash/stable/inst --disable-Werror
--with-libgmp-prefix=/mingw32 --enable-local-install
--build=x86_64-w64-mingw64  *** [4/13] [m

  [1] Rerun phase configure

Note, I have tried solution below -
* pacman -S gmp-devel gmp
* pacman -S mingw-w64-i686-gmp

Modify gnucash.module, append *--with-libgmp-prefix=/mingw32* to `autotools
id="aqbanking"` section.
*So, how to install and config gmp to build aqbanking?*

Cheers.
Hai Liang W.
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