./configure of SDL 1.2.14 in msys2

$ ./configure
configure: loading site script /mingw64/etc/config.site
checking for gcc... gcc
checking for C compiler default output file name... a.exe
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... .exe
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking how to run the C preprocessor... gcc -E
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checking minix/config.h usability... no
checking minix/config.h presence... no
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checking whether it is safe to define __EXTENSIONS__... yes
checking build system type... x86_64-w64-mingw32
checking host system type... x86_64-w64-mingw32
checking for a sed that does not truncate output... /usr/bin/sed
checking for fgrep... /usr/bin/grep -F
checking for ld used by gcc... /usr/x86_64-pc-msys/bin/ld.exe
checking if the linker (/usr/x86_64-pc-msys/bin/ld.exe) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B
checking the name lister (/usr/bin/nm -B) interface... BSD nm
checking whether ln -s works... no, using cp -p
checking the maximum length of command line arguments... 8192
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checking how to recognize dependent libraries... pass_all
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checking command to parse /usr/bin/nm -B output from gcc object... ok
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checking if gcc supports -fno-rtti -fno-exceptions... ./configure: line 7525: diff: command not found
no
checking for gcc option to produce PIC... -DDLL_EXPORT -DPIC
checking if gcc PIC flag -DDLL_EXPORT -DPIC works... yes
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checking whether the gcc linker (/usr/x86_64-pc-msys/bin/ld.exe) supports shared libraries... yes
checking whether -lc should be explicitly linked in... yes
checking dynamic linker characteristics... Win32 ld.exe
checking how to hardcode library paths into programs... immediate
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checking for gcc... (cached) gcc
checking whether we are using the GNU C compiler... (cached) yes
checking whether gcc accepts -g... (cached) yes
checking for gcc option to accept ISO C89... (cached) none needed
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking whether we are using the GNU C++ compiler... (cached) yes
checking whether g++ accepts -g... (cached) yes
checking how to run the C++ preprocessor... g++ -E
checking for ld used by g++... /usr/x86_64-pc-msys/bin/ld.exe
checking if the linker (/usr/x86_64-pc-msys/bin/ld.exe) is GNU ld... yes
checking whether the g++ linker (/usr/x86_64-pc-msys/bin/ld.exe) supports shared libraries... yes
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checking if g++ PIC flag -DDLL_EXPORT -DPIC works... yes
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checking whether the g++ linker (/usr/x86_64-pc-msys/bin/ld.exe) supports shared libraries... yes
checking dynamic linker characteristics... Win32 ld.exe
checking how to hardcode library paths into programs... immediate
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configure: creating ./config.status
config.status: creating Makefile
config.status: creating sdl-config
config.status: creating SDL.spec
config.status: creating SDL.qpg
config.status: creating sdl.pc
config.status: creating include/SDL_config.h
config.status: executing libtool commands
config.status: executing default commands
Generating dependencies for ./src/SDL.c
Generating dependencies for ./src/SDL_error.c
Generating dependencies for ./src/SDL_fatal.c
Generating dependencies for ./src/audio/SDL_audio.c
Generating dependencies for ./src/audio/SDL_audiocvt.c
Generating dependencies for ./src/audio/SDL_audiodev.c
Generating dependencies for ./src/audio/SDL_mixer.c
Generating dependencies for ./src/audio/SDL_mixer_MMX.c
Generating dependencies for ./src/audio/SDL_mixer_MMX_VC.c
Generating dependencies for ./src/audio/SDL_mixer_m68k.c
Generating dependencies for ./src/audio/SDL_wave.c
Generating dependencies for ./src/cdrom/SDL_cdrom.c
Generating dependencies for ./src/cpuinfo/SDL_cpuinfo.c
Generating dependencies for ./src/events/SDL_active.c
Generating dependencies for ./src/events/SDL_events.c
Generating dependencies for ./src/events/SDL_expose.c
Generating dependencies for ./src/events/SDL_keyboard.c
Generating dependencies for ./src/events/SDL_mouse.c
Generating dependencies for ./src/events/SDL_quit.c
Generating dependencies for ./src/events/SDL_resize.c
Generating dependencies for ./src/file/SDL_rwops.c
Generating dependencies for ./src/stdlib/SDL_getenv.c
Generating dependencies for ./src/stdlib/SDL_iconv.c
Generating dependencies for ./src/stdlib/SDL_malloc.c
Generating dependencies for ./src/stdlib/SDL_qsort.c
Generating dependencies for ./src/stdlib/SDL_stdlib.c
Generating dependencies for ./src/stdlib/SDL_string.c
Generating dependencies for ./src/thread/SDL_thread.c
Generating dependencies for ./src/timer/SDL_timer.c
Generating dependencies for ./src/video/SDL_RLEaccel.c
Generating dependencies for ./src/video/SDL_blit.c
Generating dependencies for ./src/video/SDL_blit_0.c
Generating dependencies for ./src/video/SDL_blit_1.c
Generating dependencies for ./src/video/SDL_blit_A.c
Generating dependencies for ./src/video/SDL_blit_N.c
Generating dependencies for ./src/video/SDL_bmp.c
Generating dependencies for ./src/video/SDL_cursor.c
Generating dependencies for ./src/video/SDL_gamma.c
Generating dependencies for ./src/video/SDL_pixels.c
Generating dependencies for ./src/video/SDL_stretch.c
Generating dependencies for ./src/video/SDL_surface.c
Generating dependencies for ./src/video/SDL_video.c
Generating dependencies for ./src/video/SDL_yuv.c
Generating dependencies for ./src/video/SDL_yuv_mmx.c
Generating dependencies for ./src/video/SDL_yuv_sw.c
Generating dependencies for ./src/joystick/SDL_joystick.c
Generating dependencies for ./src/video/dummy/SDL_nullevents.c
Generating dependencies for ./src/video/dummy/SDL_nullmouse.c
Generating dependencies for ./src/video/dummy/SDL_nullvideo.c
Generating dependencies for ./src/audio/disk/SDL_diskaudio.c
Generating dependencies for ./src/audio/dummy/SDL_dummyaudio.c
Generating dependencies for ./src/video/wincommon/SDL_sysevents.c
Generating dependencies for ./src/video/wincommon/SDL_sysmouse.c
Generating dependencies for ./src/video/wincommon/SDL_syswm.c
Generating dependencies for ./src/video/wincommon/SDL_wingl.c
Generating dependencies for ./src/video/windib/SDL_dibevents.c
Generating dependencies for ./src/video/windib/SDL_dibvideo.c
Generating dependencies for ./src/video/windx5/SDL_dx5events.c
Generating dependencies for ./src/video/windx5/SDL_dx5video.c
Generating dependencies for ./src/video/windx5/SDL_dx5yuv.c
Generating dependencies for ./src/audio/windib/SDL_dibaudio.c
Generating dependencies for ./src/audio/windx5/SDL_dx5audio.c
Generating dependencies for ./src/joystick/win32/SDL_mmjoystick.c
Generating dependencies for ./src/cdrom/win32/SDL_syscdrom.c
Generating dependencies for ./src/thread/win32/SDL_sysmutex.c
Generating dependencies for ./src/thread/win32/SDL_syssem.c
Generating dependencies for ./src/thread/win32/SDL_systhread.c
Generating dependencies for ./src/thread/generic/SDL_syscond.c
Generating dependencies for ./src/timer/win32/SDL_systimer.c
Generating dependencies for ./src/loadso/win32/SDL_sysloadso.c
Generating dependencies for ./src/main/win32/version.rc