some errors of making

[hcp6897]

ubuntu@ubuntu:~/Desktop/GLTools/build$ make
[ 8%] Building CXX object CMakeFiles/gltools-static.dir/src/GLTools.cpp.o
/home/ubuntu/Desktop/GLTools/src/GLTools.cpp: In function ‘GLbyte* gltReadBMPBits(const char*, int*, int*)’:
/home/ubuntu/Desktop/GLTools/src/GLTools.cpp:1060:10: error: cannot convert ‘bool’ to ‘GLbyte* {aka signed char*}’ in return
return false;
^~~~~
/home/ubuntu/Desktop/GLTools/src/GLTools.cpp:1072:10: error: cannot convert ‘bool’ to ‘GLbyte* {aka signed char*}’ in return
return false;
^~~~~
/home/ubuntu/Desktop/GLTools/src/GLTools.cpp: In function ‘GLuint gltLoadShaderTripletWithAttributes(const char*, const char*, const char*, ...)’:
/home/ubuntu/Desktop/GLTools/src/GLTools.cpp:1256:32: warning: format not a string literal and no format arguments [-Wformat-security]
fprintf(stderr, infoLog);
^
CMakeFiles/gltools-static.dir/build.make:110: recipe for target 'CMakeFiles/gltools-static.dir/src/GLTools.cpp.o' failed
make[2]: *** [CMakeFiles/gltools-static.dir/src/GLTools.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/gltools-static.dir/all' failed
make[1]: *** [CMakeFiles/gltools-static.dir/all] Error 2
Makefile:129: recipe for target 'all' failed
make: *** [all] Error 2

[hcp6897]

home/ubuntu/Desktop/GLTools/src/GLTools.cpp:1072:10: error: cannot convert ‘bool’ to ‘GLbyte* {aka signed char*}’ in return
return false;

modify the renturn NULL;