Encountering 'undefined reference' and 'error adding symbols' when compiling OpenEXR [duplicate] - linux

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What is an undefined reference/unresolved external symbol error and how do I fix it?
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Closed 7 years ago.
I am installing OpenEXR_Viewers on Ubuntu 14.04. When running the makefile, I encounter the following error:
/usr/bin/ld: ImageView.o: undefined reference to symbol 'glOrtho'
//usr/lib/x86_64-linux-gnu/mesa/libGL.so.1: error adding symbols: DSO
missing from command line collect2: error: ld returned 1 exit status
Is it likely that my lib tool invocation is not calling GL? If this is the case, how do I set my libtool to build with GL? (Edit the makefile to see OpenGl)
Making all in playexr
make[1]: Entering directory `/home/user/Documents/source/openexr/OpenEXR_Viewers/playexr'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/user/Documents/source/openexr/OpenEXR_Viewers/playexr'
Making all in exrdisplay
make[1]: Entering directory `/home/user/Documents/source/openexr/OpenEXR_Viewers/exrdisplay'
/bin/bash ../libtool --tag=CXX --mode=link g++ -pipe -g -O2 -o exrdisplay main.o ImageView.o loadImage.o scaleImage.o applyCtl.o GlWindow3d.o -L/usr/local/lib -pthread -L/usr/local/lib -lIlmImf -lImath-2_2 -lIexMath-2_2 -lHalf -lIex-2_2 -lIlmThread-2_2 -DHAVE_CTL_INTERPRETER=0 -L/usr/local/lib -DHAVE_CTL_INTERPRETER=0 -pthread -L/usr/local/lib -lIlmImf -lImath-2_2 -lIexMath-2_2 -lHalf -lIex-2_2 -lIlmThread-2_2 -Wl,-Bsymbolic-functions -lfltk_gl -lfltk -lX11
*** Warning: Linking the executable exrdisplay against the loadable module
*** libImath-2_2.so is not portable!
*** Warning: Linking the executable exrdisplay against the loadable module
*** libIexMath-2_2.so is not portable!
*** Warning: Linking the executable exrdisplay against the loadable module
*** libHalf.so is not portable!
*** Warning: Linking the executable exrdisplay against the loadable module
*** libIex-2_2.so is not portable!
*** Warning: Linking the executable exrdisplay against the loadable module
*** libIlmThread-2_2.so is not portable!
libtool: link: g++ -pipe -g -O2 -o exrdisplay main.o ImageView.o loadImage.o scaleImage.o applyCtl.o GlWindow3d.o -pthread -DHAVE_CTL_INTERPRETER=0 -DHAVE_CTL_INTERPRETER=0 -pthread -Wl,-Bsymbolic-functions -L/usr/local/lib /usr/local/lib/libIlmImf.so /usr/local/lib/libImath-2_2.so /usr/local/lib/libIexMath-2_2.so /usr/local/lib/libHalf.so /usr/local/lib/libIex-2_2.so /usr/local/lib/libIlmThread-2_2.so -lfltk_gl -lfltk -lX11 -pthread
/usr/bin/ld: ImageView.o: undefined reference to symbol 'glOrtho'
//usr/lib/x86_64-linux-gnu/mesa/libGL.so.1: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[1]: *** [exrdisplay] Error 1
make[1]: Leaving directory `/home/user/Documents/source/openexr/OpenEXR_Viewers/exrdisplay'
make: *** [all-recursive] Error 1

Answer 1

Try adding -lglut -lGL (and probably -lGLU) to you linker command.
(g++ linker: /usr/lib/libGL.so.1: could not read symbols: Invalid operation)
UPDATE:
Append it to:
FLTK_LDFLAGS = -Wl,-Bsymbolic-functions -lfltk_gl -lfltk -lX11
like
FLTK_LDFLAGS = -Wl,-Bsymbolic-functions -lfltk_gl -lfltk -lX11 -lglut -lGL