||=== Pixlings, Release ===|
..\PixGUI\lib\libPixGUI.a(button.o):button.cpp:(.text+0xc1)||undefined reference to `glColor3fv@4'|
..\PixGUI\lib\libPixGUI.a(button.o):button.cpp:(.text+0xea)||undefined reference to `glRectf@16'|
||=== Build finished: 2 errors, 0 warnings ===|

-------------- Build: Release in PixGUI ---------------
 
Compiling: element.cpp
Compiling: engine.cpp
Compiling: window.cpp
Compiling: button.cpp
Linking static library: lib\libPixGUI.a
ar.exe: creating lib\libPixGUI.a
Output size is 39.72 KB
Process terminated with status 0 (0 minutes, 2 seconds)
0 errors, 0 warnings

-------------- Build: Debug in Pixlings ---------------
 
Compiling: Program.cpp
Compiling: game.cpp
Compiling: main.cpp
Compiling: Menu.cpp
Linking console executable: bin\Debug\Pixlings.exe
..\PixGUI\lib\libPixGUI.a(button.o):button.cpp:(.text+0xc1): undefined reference to `glColor3fv@4'
..\PixGUI\lib\libPixGUI.a(button.o):button.cpp:(.text+0xea): undefined reference to `glRectf@16'
collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 1 seconds)
2 errors, 0 warnings