multimedia/mpv build fails

["John D. Baker" <jdbaker%consolidated.net@localhost>]

It seems to succeed in the bulk-build logs I've looked at, but on my
9.2_STABLE/amd64 system, "multimedia/mpv" fails with:

[...]
===> Configuring for mpv-0.34.0nb1
=> Fix Python command names.
=> Generating pkg-config file for builtin expat package.
=> Generating pkg-config files for builtin xz package.
=> Adding run-time search paths to pkg-config files.
cd /tmp/pkgsrc/multimedia/mpv/work/mpv-0.34.0 && /usr/bin/env CC=gcc CFLAGS=-O2\ -fPIC\ -D_FORTIFY_SOURCE=2\ -I/usr/pkg/include\ -I/usr/X11R7/include/freetype2\ -I/usr/include\ -I/usr/X11R7/include\ -I/usr/pkg/include/lua-5.2\ -I/usr/include/readline\ -I/usr/pkg/include/SDL2\ -I/usr/X11R7/include/libdrm\ -I/usr/pkg/include/python3.9\ -I/usr/pkg/include/harfbuzz\ -I/usr/pkg/include/glib-2.0\ -I/usr/pkg/include/gio-unix-2.0\ -I/usr/pkg/lib/glib-2.0/include\ -I/usr/pkg/include/ffmpeg4 CXX=c++ CXXFLAGS=-O2\ -fPIC\ -D_FORTIFY_SOURCE=2\ -I/usr/pkg/include\ -I/usr/X11R7/include/freetype2\ -I/usr/include\ -I/usr/X11R7/include\ -I/usr/pkg/include/lua-5.2\ -I/usr/include/readline\ -I/usr/pkg/include/SDL2\ -I/usr/X11R7/include/libdrm\ -I/usr/pkg/include/python3.9\ -I/usr/pkg/include/harfbuzz\ -I/usr/pkg/include/glib-2.0\ -I/usr/pkg/include/gio-unix-2.0\ -I/usr/pkg/lib/glib-2.0/include\ -I/usr/pkg/include/ffmpeg4 DESTDIR=/tmp/pkgsrc/multimedia/mpv/work/.destdir LINKFLAGS=\ \ \ -L/usr/pkg/lib\ -Wl,-R/usr/pkg/lib\ -L/usr/X11R7/lib\ -Wl,-R/usr/X11R7/lib\ -L/usr/lib\ -Wl,-R/usr/lib\ -L/usr/pkg/lib/ffmpeg4\ -Wl,-R/usr/pkg/lib/ffmpeg4 PATH=/tmp/pkgsrc/multimedia/mpv/work/.cwrapper/bin:/tmp/pkgsrc/multimedia/mpv/work/.buildlink/bin:/tmp/pkgsrc/multimedia/mpv/work/.gcc/bin:/tmp/pkgsrc/multimedia/mpv/work/.tools/bin:/usr/pkg/bin:/var/home/sysop/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/X11R7/bin:/usr/X11R6/bin:/usr/pkg/bin:/usr/pkg/sbin:/usr/games:/usr/local/bin:/usr/local/sbin PREFIX=/usr/pkg JOBS=5 ./waf --mandir=/usr/pkg/man --libdir=/usr/pkg/lib --bindir=/usr/pkg/bin --enable-dvdnav --enable-libmpv-shared --disable-alsa --enable-libbluray --enable-caca --enable-lua --disable-jack --disable-openal --disable-pulse --enable-sdl2 --enable-vaapi --enable-vdpau --enable-drm --disable-wayland --enable-x11 configure
env: ./waf: No such file or directory
*** Error code 127

Stop.
make[1]: stopped in /x/pkgsrc/multimedia/mpv


The 'waf' executable is in the ${WRKSRC} directory and has mode 755,
so I don't know why 'env' is claiming it doesn't exist.

I changed to the ${WRKSRC} directory and tried pasting the "/usr/bin/env ..."
command line, but it was truncated--seemed to be limited by the shell.  It
ended in the "LINKFLAGS= ..." variable assignment and no more could be
pasted after that.

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