diff -uNr a/smg_comms/manifest b/smg_comms/manifest
--- a/smg_comms/manifest 32a691949af3fb21eaf17c73269d01a30cb9f940ee5662772eb2c5e67a8352aedc07b8a7cba6a6d7f7be1e42559e003b82bbeb97fb059ffb579bcc33a9ab2693
+++ b/smg_comms/manifest eb605c2d9a19292f7345ee219457ff5e35e867757d4b62c0b7b3ab26edfc6a0c91ff177e5eed83c14dd84969650c8e151c4672d13ba965696a88ed387966ebf8
@@ -6,3 +6,4 @@
 548433 smg_comms_packing_rsa diana_coman Packing/Unpacking RSA messages <-> RSA packets of Eulora's communication protocol.
 548894 smg_comms_80cols diana_coman Changes tests for RSA to read the key from a file in order to avoid lines > 80 columns in the code itself.
 549511 smg_comms_skeys_smsgs diana_coman Defines data structures and message types as well as methods for reading/writing Serpent keysets to/from Serpent messages.
+549837 smg_comms_mpi_c_version bvt Enforces default C version of gcc 4.9 (gnu89)
diff -uNr a/smg_comms/mpi/mpi.gpr b/smg_comms/mpi/mpi.gpr
--- a/smg_comms/mpi/mpi.gpr 9f5e8e039129a65969e8e89ed17dfa033676d406e8e872fd9f47fac0bc207acce55201d257671b39e46dc90909109588398005f5db9b1fda3cdf3a97cf434f99
+++ b/smg_comms/mpi/mpi.gpr dfda005e8b4faa8faaacc1a0e6b5727ab4c8e4cb316c85b99317bebf1af3ae2d33b315997843f99801a0f0112ebaa91f35add90fe8152ff21be8aeadc543b501
@@ -9,5 +9,8 @@
   for Object_Dir use "obj";
   for Library_Dir use "bin";
 
+  package Compiler is
+     for Switches ("C") use ("-std=gnu89");
+  end Compiler;
 end MPI;