you set CPLUS_INCLUDE_PATH=/usr/include, which excludes all other
standard include directories.
plus see the warning:
$ g++-4.3 -o hm hm.cpp
In file included from /usr/include/c++/4.3/ext/hash_map:64,
from hm.cpp:1:
/usr/include/c++/4.3/backward/backward_warning.h:33:2: warning: #warning This
file includes at least one deprecated or antiquated header which may be removed
without further notice at a future date. Please use a non-deprecated interface
with equivalent functionality instead. For a listing of replacement headers and
interfaces, consult the file backward_warning.h. To disable this warning use
-Wno-deprecated.
** Changed in: gcc-4.3 (Ubuntu)
Status: New => Invalid
--
CPLUS_INCLUDE_PATH behaves differently with g++ 4.2 and g++ 4.3
https://bugs.launchpad.net/bugs/298774
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