Fix libharu installation directory

mingw-w64-libharu/PKGBUILD

@@ -21,17 +21,16 @@ prepare() {
 
 build() {
   cd "$srcdir/$_realname-RELEASE_${pkgver//./_}"
-  mkdir build
+  mkdir -p build
   cd build
-  cmake -G"MSYS Makefiles" \
-		-Wno-dev \
-		-DCMAKE_SYSTEM_PREFIX_PATH:PATH=/mingw64/bin/ \
-		-DCMAKE_C_COMPILER=gcc \
-		-DCMAKE_MAKE_PROGRAM=mingw32-make \
+  MSYS2_ARG_CONV_EXCL="-DCMAKE_INSTALL_PREFIX=" \
+  ${MINGW_PREFIX}/bin/cmake.exe -G"MSYS Makefiles" \
+		-DCMAKE_C_COMPILER=${MINGW_PREFIX}/bin/gcc.exe \
+		-DCMAKE_MAKE_PROGRAM=${MINGW_PREFIX}/bin/mingw32-make.exe \
 		-DCMAKE_BUILD_TYPE=Release \
 		-DBUILD_SHARED_LIBS=ON \
 		-DBUILD_STATIC_LIBS=ON \
-		-DCMAKE_INSTALL_PREFIX=/usr ..
+		-DCMAKE_INSTALL_PREFIX=${MINGW_PREFIX} ..
   mingw32-make
 }