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EPerF fails when building on OS X 10.7.4 / GCC 4.2 and 4.7

make -C lib
g++ -g -O2 -fPIC -c EPerfData.cpp
In file included from ../include/EPerf/EPerfData.h:15,
from EPerfData.cpp:1:
../include/EPerf/EPerfClock.h:16: error: ‘clockid_t’ does not name a type
../include/EPerf/EPerfClock.h:19: error: expected ‘,’ or ‘...’ before ‘&’ token
../include/EPerf/EPerfClock.h:19: error: ISO C++ forbids declaration of ‘clockid_t’ with no type
../include/EPerf/EPerfClock.h: In member function ‘void ENHANCE::EPerfClock::takeStartStamp()’:
../include/EPerf/EPerfClock.h:21: error: ‘clock_gettime’ was not declared in this scope
../include/EPerf/EPerfClock.h: In member function ‘void ENHANCE::EPerfClock::takeStopStamp()’:
../include/EPerf/EPerfClock.h:22: error: ‘clock_gettime’ was not declared in this scope
EPerfData.cpp: In constructor ‘ENHANCE::EPerfData::EPerfData()’:
EPerfData.cpp:6: error: no matching function for call to ‘ENHANCE::EPerfClock::EPerfClock()’
../include/EPerf/EPerfClock.h:19: note: candidates are: ENHANCE::EPerfClock::EPerfClock(int)
../include/EPerf/EPerfClock.h:12: note: ENHANCE::EPerfClock::EPerfClock(const ENHANCE::EPerfClock&)
EPerfData.cpp:11: error: ‘CLOCK_MONOTONIC’ was not declared in this scope
EPerfData.cpp:14: error: ‘CLOCK_PROCESS_CPUTIME_ID’ was not declared in this scope
make[1]: *** [EPerfData.o] Error 1
make: *** [build-lib] Error 2

--> clock_gettime not natively supported on OS X