ffmpeg build issues

    -- (working directory is /tmp/ffmpeg-20160407-git-0c94906)
$ pkg-config --debug x265
no output option set, defaulting to --exists
Error printing disabled by default due to use of output options --exists, --atleast/exact/max-version or no output option at all. Value of --print-errors: 0
Error printing disabled
Adding virtual 'pkg-config' package to list of known packages
Scanning directory '/mingw64/lib/pkgconfig'
Ignoring file '.' in search directory; not a .pc file
Ignoring file '..' in search directory; not a .pc file
File 'bzip2.pc' appears to be a .pc file
Will find package 'bzip2' in file '/mingw64/lib/pkgconfig/bzip2.pc'
File 'cairo-fc.pc' appears to be a .pc file
Will find package 'cairo-fc' in file '/mingw64/lib/pkgconfig/cairo-fc.pc'
File 'cairo-ft.pc' appears to be a .pc file
Will find package 'cairo-ft' in file '/mingw64/lib/pkgconfig/cairo-ft.pc'
[Ommited]
File 'libsvn_subr.pc' appears to be a .pc file
Will find package 'libsvn_subr' in file '/usr/share/pkgconfig/libsvn_subr.pc'
File 'libsvn_wc.pc' appears to be a .pc file
Will find package 'libsvn_wc' in file '/usr/share/pkgconfig/libsvn_wc.pc'
Looking for package 'x265'
Looking for package 'x265-uninstalled'
Reading 'x265' from file '/c/Program Files (x86)/x265/lib/pkgconfig/x265.pc'
Parsing package file '/c/Program Files (x86)/x265/lib/pkgconfig/x265.pc'
  line>prefix=C:/Program Files (x86)/x265
 Variable declaration, 'prefix' has value 'C:/Program Files (x86)/x265'
  line>exec_prefix=${prefix}
 Variable declaration, 'exec_prefix' has value 'C:/Program Files (x86)/x265'
  line>libdir=${exec_prefix}/lib
 Variable declaration, 'libdir' has value 'C:/Program Files (x86)/x265/lib'
  line>includedir=${prefix}/include
 Variable declaration, 'includedir' has value 'C:/Program Files (x86)/x265/include'
  line>
  line>Name: x265
  line>Description: H.265/HEVC video encoder
  line>Version: 1.9
  line>Libs: -L${libdir} -lx265
  line>Libs.private: -lstdc++ -lmingw32 -lmoldname -lmingwex -lmsvcrt -ladvapi32 -lshell32 -luser32 -lkernel32 -lmingw32 -lmoldname -lmingwex -lmsvcrt
  line>Cflags: -I${includedir}
Path position of 'x265' is 3
Adding 'x265' to list of known packages

$ ./configure --enable-libx265 --prefix=/usr --enable-gpl
./configure: eval: line 518: syntax error near unexpected token `('
./configure: eval: line 518: `case (x86)/x265/include in -l*|*.so) ;; *) echo (x86)/x265/include ;; esac'
./configure: eval: line 510: syntax error near unexpected token `('
./configure: eval: line 510: `case (x86)/x265/include in -l*|*.so) echo (x86)/x265/include ;; esac'
ERROR: x265 not found using pkg-config

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solve the problem.