[MacPorts] #57756: mathgl: fatal error: 'Fl/Fl_RGB_Image.H' file not found

[MacPorts]

#57756: mathgl: fatal error: 'Fl/Fl_RGB_Image.H' file not found
------------------------+-------------------------
 Reporter:  ryandesign  |      Owner:  Schamschula
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  mathgl
------------------------+-------------------------
 [https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/75584/steps
 /install-port/logs/stdio mathgl fails to build on case-sensitive
 filesystems] like the buildbot workers':

 {{{
 /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_math_mathgl/mathgl/work/mathgl-2.4.2.1/widgets/image.h:21:10:
 fatal error: 'Fl/Fl_RGB_Image.H' file not found
 #include <Fl/Fl_RGB_Image.H>
          ^~~~~~~~~~~~~~~~~~~
 1 error generated.
 }}}

 The directory name is FL, not Fl.

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Ticket URL: <https://trac.macports.org/ticket/57756>
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