lpthreadGC2 problem on Cygwin and the same on MinGW

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Cygwin

MinGW

I have a folder includes many c++, c, h, object files as well as a MakeFile. So, I used Cygwin as well as MinGW to create an executable file namely calibrator.exe.

So, I address the target folder and type in "make all". On both MinGW and CygWin got the following errors.

CygWin:

g++ -O3 -gstabs -Wall -DHAVE_CONFIG_H=1 -DMEASURES_BITS_16WIDE `fltk-config --cxxflags` -I/usr/include/libxml2 -I../emeter-toolkit -I../emeter-metrology/include -I../emeter-app -ocalibrator.exe cal-gui.o cal-control.o generator.o generator-by2463m.o generator-kaipu.o generator-ptc8320m.o generator-manual.o generator-pts3_3.o generator-pts3_3c.o generator-tf9100.o generator-star.o gui.o meter-control.o meter-access-dlt645.o meter-consumption-window.o meter-readings-window.o meter-support-windows.o ref-meter-by2463m.o ref-meter-control.o ref-meter-hsiang-cheng-hc3100.o ref-meter-kaipu-p3001c.o ref-meter-pts3_3.o ref-meter-pts3_3c.o ref-meter-star-s6502.o ref-meter-mixed.o pts3_3.o pts3_3c.o kaipu_p3001c.o serial.o meter-interact-dlt645.o -L/MinGW/bin -lxml2 -lpthreadGC2 `fltk-config --ldflags`
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lpthreadGC2
collect2: error: ld returned 1 exit status
Makefile:100: recipe for target 'calibrator.exe' failed
make: *** [calibrator.exe] Error 1

MinGW:

Click here!

So as you can see, seems in my cygwin and MinGW Bin's Folder there is something missing which is called "LpthreadGC2". I looked in this folder and found nothing under this name.

So, what do you think? How can I fix this problem and make .exe? what is the extension of this file? Is this a .dll file or so? Any idea please?

Thank you in advance!