On 2020-10-21 06:07, ken williams wrote:
> Now I want to run the test from "Programming Principle and Practice" with the code:
> 
>     #include <FL/Fl.h>
>     #include <FL/Fl_Box.h>
>     #include <FL/Fl_Window.h>

	Oh no, if the book has lowercase .h's, then I'm afraid it's a mistake in the book.
	.H is correct for those.

	You can get away with the wrong case on some platforms (windows + mac), but not on linux,
	freebsd, etc.

	FLTK uses ".H" for C++ includes, and ".h" for C include files.

> But now I have this compile error:
> 
>     ken@Lnx fltk_test]$ g++ fltk_test.cpp

	No, you can't just compile FLTK this way. There's many libraries that need to
	be included on the command line.

	Use instead:

		fltk-config --compile fltk_test.cpp

	..and you'll likely get better results. fltk-config has other command flags
	to let you get the list of compiler flags, libraries, etc. if you're trying
	to compile more complicated applications that have many modules using a Makefile.

	But for a single .cpp file like you have, the above should work fine.

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