поиск gdb исходных каталогов

(gdb) help files
Specifying and examining files.

List of commands:

add-shared-symbol-files -- Load the symbols from shared objects in the dynamic linkers link map  
add-symbol-file -- Load symbols from FILE  
add-symbol-file-from-memory -- Load the symbols out of memory from a dynamically loaded object file  
cd -- Set working directory to DIR for debugger and program being debugged  
core-file -- Use FILE as core dump for examining memory and registers  
directory -- Add directory DIR to beginning of search path for source files
edit -- Edit specified file or function  
exec-file -- Use FILE as program for getting contents of pure memory  
file -- Use FILE as program to be debugged  
forward-search -- Search for regular expression (see regex(3)) from last line listed  
generate-core-file -- Save a core file with the current state of the debugged process  

(gdb) help directory  

Add directory DIR to beginning of search path for source files.  
Forget cached info on source file locations and line positions.  
DIR can also be $cwd for the current working directory, or $cdir for the  
directory in which the source file was compiled into object code.  
With no argument, reset the search path to $cdir:$cwd, the default.  

Для этого вам понадобится команда set substitute-path .

    (gdb) set substitute-path /usr/src/include /mnt/include

Однако доступна только в последних версиях (6.6+) gdb.