GNUmakefile covering sources in different directories

[Philip Mötteli]

Hi


I try to port OmniFoundation to Linux. OmniFoundation has its sources  
distributed over different directories. When I include in my  
GNUmakefile a source from a different directory like this:

OmniFoundation_OBJC_FILES= \
OpenStepExtensions/NSArray-OFExtensions.m


The compiler tries to create a subdirectory in the headers directory:

/usr/bin/install: cannot create regular file  
`./OmniFoundation.framework/Versions/A/Headers/OpenStepExtensions/ 
sha1.h': No such file or directory


These files are part of the library as those from the root directory.  
They are not independant. They should be linked to the library, like  
all the others.

How do I have to include files in my GNUmakefile, that are in a  
subdirectory, so that they are treated like all the others?


Thanks
Phil