Build files for SILLY on MSYS2

PKGBUILD

# Maintainer: Your Name <youremail@domain.com>
#
# SILLY PKGBUILD based on the PKGBUILD in the ArchLinux repositories.

_realname=SILLY
pkgname=${MINGW_PACKAGE_PREFIX}-${_realname}
pkgver=0.1.0
pkgrel=6
pkgdesc="Simple Image Loading LibrarY, a part of the CEGUI project"
arch=('any')
url="http://www.cegui.org.uk/wiki/index.php/SILLY"
license=('MIT')
depends=("${MINGW_PACKAGE_PREFIX}-gcc-libs"
	 "${MINGW_PACKAGE_PREFIX}-libjpeg"
	 "${MINGW_PACKAGE_PREFIX}-libpng")
makedepends=("${MINGW_PACKAGE_PREFIX}-gcc"
	     "${MINGW_PACKAGE_PREFIX}-pkg-config")
source=(http://downloads.sourceforge.net/crayzedsgui/SILLY-${pkgver}.tar.gz
        silly-libpng1.5.patch)
md5sums=('c3721547fced7792a36ffc9ce6ec23fd'
         '530551c2942aea6fa20f10d06f1e604f')
options=("staticlibs" "strip")

prepare() {
    cd "${_realname}-${pkgver}"
    patch -Np1 < $srcdir/silly-libpng1.5.patch  
}

build() {
    cd "${_realname}-${pkgver}"

    # SILLY fails to link against -lpng16 if relying on pkg-config,
    # so specify it explicitely here.
    export PNG_LIBS="-lpng16"
  ./configure --prefix=${MINGW_PREFIX} --build=${MINGW_CHOST} --host=${MINGW_CHOST} --target=${MINGW_CHOST} --enable-static --enable-shared
  make
}

package() {
    cd "${_realname}-${pkgver}"

    make DESTDIR="${pkgdir}/" install
    install -D -m644 COPYING "${pkgdir}/usr/share/licenses/${pkgname}/COPYING"
}

silly-libpng1.5.patch

ILLY-0.1.0/src/loaders/SILLYPNGImageLoader.cpp~ SILLY-0.1.0/src/loaders/SILLYPNGImageLoader.cpp
--- SILLY-0.1.0/src/loaders/SILLYPNGImageLoader.cpp~    2006-06-19 00:42:12.000000000 +0200
+++ SILLY-0.1.0/src/loaders/SILLYPNGImageLoader.cpp 2011-12-06 14:38:31.738251526 +0100
@@ -64,10 +64,7 @@ void PNG_error_function(png_structp png_
                         png_const_charp error)
 {
     //  printf("PNG Error: %s\n", error);
-    // copied from libpng's pngerror.cpp
-    jmp_buf buf;
-    memcpy(buf, png_ptr->jmpbuf, sizeof(jmp_buf));
-    longjmp(buf, 1);
+    png_longjmp(png_ptr, 1);
 }