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freebsd-ports/devel/makedepend/pkg-descr

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Makedepend is a makefile dependency generator from The XFree86 Project, Inc.
If you have X installed, you already have makedepend and do not need this port!
Makedepend reads each sourcefile in sequence and parses it like a
C-preprocessor, processing all #include, #define, #undef, #ifdef, #ifndef,
#endif, #if and #else directives so that it can correctly tell which #include,
directives would be used in a compilation. Any #include, directives can
reference files having other #include directives, and parsing will occur in
these files as well.
Every file that a sourcefile includes, directly or indirectly, is what
makedepend calls a "dependency". These dependencies are then written to a
makefile in such a way that make will know which object files must be
recompiled when a dependency has changed.