GMT-5.1.0 Installation problems

Hello!
I am trying to install GMT 5.1.0. I am using SO ubuntu 12.04 (64 bits), netcdf 
library 4.3.0 , HDF5 v. 1.8.11. All the "make check" for these packages are 
succesful.
I am following "online instructions for building GMT from source".
When I compile GMT I get the following error message:
/root/gmt-5.1.0/src/mgd77/mgd77.c: In function ‘MGD77_Parse_Corrtable’:
/root/gmt-5.1.0/src/mgd77/mgd77.c:5626:21: error: ‘exp’ undeclared (first use 
in this function)
/root/gmt-5.1.0/src/mgd77/mgd77.c:5626:21: note: each undeclared identifier is 
reported only once for each function it appears in

I add a new line in the program mgd77.c in order to declare previously 'exp' 
function. I get to compile everything but later, when I ran 
the example_01, I get a "Segmentation fault (core dumped)" messsage.

Could someone help me, please? 

Thanks you.
Sara

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