Change install prefix to LIBRARY_PREFIX
set PATH=%PATH:C:\Program Files\Git\usr\bin;=%
:: Configure.
-cmake -G "MinGW Makefiles" -D CMAKE_INSTALL_PREFIX=%PREFIX% .
+cmake -G "MinGW Makefiles" -D CMAKE_INSTALL_PREFIX=%LIBRARY_PREFIX% .
if errorlevel 1 exit 1
:: Build.
