#5 lost assert header

[evoupx]

when i compile the src, show follow message.
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$ sudo make
make all-am
make[1]: Entering directory `~/gtags-0.1'
if g++ -DHAVE_CONFIG_H -I. -I. -I. -I./src -g -O2 -MT gtags.o -MD -MP -MF ".deps/gtags.Tpo" -c -o gtags.o gtags.cc; \
then mv -f ".deps/gtags.Tpo" ".deps/gtags.Po"; else rm -f ".deps/gtags.Tpo"; exit 1; fi
gtags.cc: In member function ‘bool TagsTable::ReloadTagFile(std::string)’:
gtags.cc:169: error: ‘assert’ was not declared in this scope
gtags.cc:187: error: ‘assert’ was not declared in this scope
make[1]: *** [gtags.o] 错误 1
make[1]: Leaving directory `/home/evoup/software/gtags/gtags-0.1'
make: *** [all] 错误 2
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then i add #include <assert.h> in gtags.cc
make again ,ok!
this bug occur in debian6