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I'm trying to compile Qscintilla 2.9.2 on Ubuntu 16.04 64bit using Qt 5.7 got the following error message:

-L/home/mwambi/Qt5.7.0/5.7/gcc_64/lib -lQt5PrintSupport -L/usr/lib64 -lQt5Widgets -lQt5Gui -lQt5Core -lpthread -lGL  
/usr/bin/ld: cannot find -lGL
collect2: error: ld returned 1 exit status
Makefile:979: recipe for target 'libqscintilla2.so.12.0.1' failed
make: *** [libqscintilla2.so.12.0.1] Error 1

I do not know what the library GL is and where to find it. How can I solve this?

Amani
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1 Answers1

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In my experience, this troubleshooting procedure is enough to solve about 90% of missing library issues during compilation:

  1. "-l[name]" implies there's a "lib[name].so"

  2. Search your system for "lib[name]" (use locate or find).

    If you find it on your system, check paths ($LB_LIBRARY_PATH and the build system's -L flags) and verify that the architecture matches (x86+64 vs. i686).

  3. Do a repository search for "lib[name]" (use apt, yum, synaptic, &c.).

    Install it if it's missing.

  4. Type "lib[name].so" into google or a dedicated package-search site (like RPMFind or packages.ubuntu.com) and see what package names come up, then search for as in #2-3.

In this case, libGL is an implementation of OpenGL. You can install Mesa or find an alternative implementation (I've only ever used Qt with Mesa). Here's a list of packages that provide libGL; if you already have one of these installed on your system, try fetching the dev versions of whichever ones you already have.

Alex P
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