#8 make check fails on Linux

[André Guerreiro]

My Environment:
mfGraph version: 0.4.3
$ gcc --version:
> gcc (GCC) 4.3.2

Build output:

make[2]: Entering directory `/home/aguerreiro/mfgraph-0.4.3/test'
g++ -DPACKAGE_NAME=\"mfGraph\" -DPACKAGE_TARNAME=\"mfgraph\" -DPACKAGE_VERSION=\"0.4.3\" -DPACKAGE_STRING=\"mfGraph\ 0.4.3\" -DPACKAGE_BUGREPORT=\"foetsch@users.sourceforge.net\" -DPACKAGE_URL=\"\" -DPACKAGE=\"mfgraph\" -DVERSION=\"0.4.3\" -DYYTEXT_POINTER=1 -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -DHAVE_PYTHON=\"2.6\" -I. -I../src -I../src -g -O2 -MT cpp_test-cpp_test.o -MD -MP -MF .deps/cpp_test-cpp_test.Tpo -c -o cpp_test-cpp_test.o `test -f 'cpp_test.cpp' || echo './'`cpp_test.cpp
cpp_test.cpp: In function ‘int main(int, char**)’:
cpp_test.cpp:10: error: ‘getenv’ was not declared in this scope