ifneq ($(shell which $(host)-g++-posix),)
mingw32_CXX := $(host)-g++-posix
endif

mingw32_CFLAGS=-pipe
mingw32_CXXFLAGS=$(mingw32_CFLAGS)

mingw32_release_CFLAGS=-O2
mingw32_release_CXXFLAGS=$(mingw32_release_CFLAGS)

mingw32_debug_CFLAGS=-O1
mingw32_debug_CXXFLAGS=$(mingw32_debug_CFLAGS)

mingw32_debug_CPPFLAGS=-D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC

mingw_cmake_system=Windows

ifneq ($(shell $(SHELL) $(.SHELLFLAGS) "command -v $(host)-g++-posix"),)
mingw32_CXX := $(host)-g++-posix
endif

mingw32_CFLAGS=-pipe
mingw32_CXXFLAGS=$(mingw32_CFLAGS)

mingw32_release_CFLAGS=-O2
mingw32_release_CXXFLAGS=$(mingw32_release_CFLAGS)

mingw32_debug_CFLAGS=-O1
mingw32_debug_CXXFLAGS=$(mingw32_debug_CFLAGS)

mingw32_debug_CPPFLAGS=-D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC

mingw_cmake_system=Windows

Replace `which` command with `command -v`
build: Replace `which` command with `command -v`

This change made in a way that is compatible with GNU Make versions
older than 4.3.
