The Kdevelop wiki says (bottom of the page)
*For cases where KDevelop is still not figuring out the include path properly after you have configured your build toolchain, you can manually add include paths on a per-directory basis into a .kdev_include_paths file. This can be done from inside KDevelop by running the “solve problem” wizard associated with a “could not find include file” problem, e.g. by hovering the problematic #include line.*
Now, i have done this (and there are no longer any problematic, underlined, #include line). But when i try to build, i get:
~/projects/mqncpptest/build> make
[100%] Building CXX object CMakeFiles/mqncpptest.dir/main.cpp.o
~/projects/mqncpptest/main.cpp:15:23: fatal error: Eigen/Dense: No such file or directory
compilation terminated.
user BЈовић asks for more information:
I followed the KDEvelop instruction for a minimal compile. Project->new from template -> standard (simple C make based c++ application). Version control system is “none” and cmake directory is: /usr/bin/cmake. Then KDEvelop underlined #include <Eigen/Dense>, i clicked on “add custom include path” pop up on the lower end of the screen, entered the path the eigen, which removed the underlining of #include <Eigen/Dense> and then Build and then i get /home/kaveh/projects/mqn_get/main.cpp:15:23: fatal error: Eigen/Dense: No such file or directory. I should add that this code builds without a problem in eclipse and from the shell.
Motivation: I’m trying to build it under kdevelop because i need to use a debugger (the code doesn’t give the intended results) and eclipse is just too heavy IMO.
What you did is that you included a directory for the parser, but not for the build. In order to do that, you need to modify your make file.
For g++, you need to use -I option.