pthread dependency in webp-leptonica about webp HOT 2 CLOSED

This is the link error
cd /c/src/webp/libwebp
CC=mingw32-gcc CXX=mingw32-g++ ./configure -prefix=/mingw
make clean
make
...
make[2]: Entering directory `/c/src/webp/libwebp/src'
g++ -Werror -Wall -O2 -g -O2 -L/usr/X11R6/lib -L/usr/local/lib  -o webpconv.exe
webpimg.o webpconv.o -llept -ljpeg -lpng -lz -lm -lvpx -lpthread -lvpx
c:/mingw/bin/../lib/gcc/mingw32/4.5.0/../../../../mingw32/bin/ld.exe: cannot fin
d -lpthread
collect2: ld returned 1 exit status
make[2]: *** [webpconv.exe] Error 1

The references are found here:
src\Makefile:VPX_LIBS = -lvpx -lpthread
src\Makefile.am:VPX_LIBS = -lvpx -lpthread
src\Makefile.in:VPX_LIBS = -lvpx -lpthread

Removing those references, webp builds ok on msys

Now in the new reference implementations for WebP encoder & decoder, 'pthread' 
dependency is not required:

ikas[104] ldd /usr/local/bin/cwebp
    linux-vdso.so.1 =>  (0x00007fffc79ff000)
    libwebp.so.0 => /usr/local/lib/libwebp.so.0 (0x00007f3adbfbe000)
    libpng12.so.0 => /lib/libpng12.so.0 (0x00007f3adbd97000)
    libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0x00007f3adbb72000)
    libc.so.6 => /lib/libc.so.6 (0x00007f3adb7ef000)
    libm.so.6 => /lib/libm.so.6 (0x00007f3adb56c000)
    libz.so.1 => /lib/libz.so.1 (0x00007f3adb354000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f3adc202000)

vikas[106] ldd /usr/local/bin/dwebp
    linux-vdso.so.1 =>  (0x00007fff5dbff000)
    libwebp.so.0 => /usr/local/lib/libwebp.so.0 (0x00007ffe10935000)
    libpng12.so.0 => /lib/libpng12.so.0 (0x00007ffe1070e000)
    libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0x00007ffe104e9000)
    libc.so.6 => /lib/libc.so.6 (0x00007ffe10166000)
    libm.so.6 => /lib/libm.so.6 (0x00007ffe0fee3000)
    libz.so.1 => /lib/libz.so.1 (0x00007ffe0fccb000)
    /lib64/ld-linux-x86-64.so.2 (0x00007ffe10b79000)