Hi, I tried installing GDB-4.18 on IBM machine i.e rem1ap51:/xalocal/home/xausr2> uname -a AIX rem1ap51 3 4 004555984C00 I got the following error during make rem1ap51:/xalocal/home/xa21/gdb-4.18>./configure /* gone through with out error */ rem1ap51:/xalocal/home/xa21/gdb-4.18>make ... ... Target "all" is up to date. xaxlc -c -g -DHAVE_UNISTD_H=1 -DHAVE_GETPAGESIZE=1 -DHAVE_LIMITS_H=1 -DHAVE_STDDEF_H=1 -I. -I./../include ./mm.c "./sbrk-sup.c", line 27.8: 1506-343 (S) Redeclaration of sbrk differs from previous declaration on line 586 of "/usr/include/unistd.h". "./sbrk-sup.c", line 27.8: 1506-377 (I) The type "int" of parameter 1 differs from the previous type "long". make: 1254-004 The error code from the last command is 1. Stop. make: 1254-004 The error code from the last command is 2. Stop. Could you please guide me what to do to get rid of this error and install gdb successfully. Thanks Srinivas