ffmpeg configure error of libmodplug on MingW

check_pkg_config libmodplug libmodplug/modplug.h ModPlug_Load
pkg-config --static --exists --print-errors libmodplug
check_func_headers libmodplug/modplug.h ModPlug_Load -ID:/MinGW6/msys/1.0/local/include -LD:/MinGW6/msys/1.0/local/lib -lmodplug -lstdc++ -lm
check_ld cc -ID:/MinGW6/msys/1.0/local/include -LD:/MinGW6/msys/1.0/local/lib -lmodplug -lstdc++ -lm
check_cc -ID:/MinGW6/msys/1.0/local/include -LD:/MinGW6/msys/1.0/local/lib
BEGIN /tmp/ffconf.FbolZHex.c
    1   #include <libmodplug/modplug.h>
    2   long check_ModPlug_Load(void) { return (long) ModPlug_Load; }
    3   int main(void) { return 0; }
END /tmp/ffconf.FbolZHex.c
gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -U__STRICT_ANSI__ -D__USE_MINGW_ANSI_STDIO=1 -D__printf__=__gnu_printf__ -std=c99 -fomit-frame-pointer -ID:/MinGW6/msys/1.0/local/include -LD:/MinGW6/msys/1.0/local/lib -c -o /tmp/ffconf.rRcIvSRe.o /tmp/ffconf.FbolZHex.c
gcc -Wl,--nxcompat -Wl,--dynamicbase -Wl,--as-needed -ID:/MinGW6/msys/1.0/local/include -LD:/MinGW6/msys/1.0/local/lib -o /tmp/ffconf.LNKTNESB.exe /tmp/ffconf.rRcIvSRe.o -lmodplug -lstdc++ -lm -lm -lz -lpsapi -ladvapi32 -lshell32
C:/Users/augus/AppData/Local/Temp/ffconf.rRcIvSRe.o:ffconf.FbolZHex.c:(.text+0x1): undefined reference to `_imp__ModPlug_Load'
collect2.exe: error: ld returned 1 exit status
ERROR: libmodplug not found