Building ganglia on Solaris 10 requires an additional compile flag. 
Specifcally, "-std=gnu99" needs to be added to CFLAGS.

The full build error:

[beckerjes@kronos:~/ganglia/ganglia-3.1.1]$ gmake
gmake  all-recursive
gmake[1]: Entering directory `/home/beckerjes/ganglia/ganglia-3.1.1'
Making all in lib
gmake[2]: Entering directory `/home/beckerjes/ganglia/ganglia-3.1.1/lib'
if gcc -DHAVE_CONFIG_H -I. -I. -I..    -I.. -I. -I../include/
-D_LARGEFILE64_SOURCE   -I/usr/local/ganglia/include -I/usr/local/apr/include
-fno-strict-aliasing -Wall -D__EXTENSIONS__ -D_POSIX_C_SOURCE=200112L
-DHAVE_STRERROR -MT getopt1.o -MD -MP -MF ".deps/getopt1.Tpo" -c -o getopt1.o
getopt1.c; \
then mv -f ".deps/getopt1.Tpo" ".deps/getopt1.Po"; else rm -f
".deps/getopt1.Tpo"; exit 1; fi
In file included from /usr/include/iso/ctype_iso.h:30,
                 from /usr/include/ctype.h:18,
                 from getopt.h:34,
                 from getopt1.c:25:
/usr/include/sys/feature_tests.h:336:2: #error "Compiler or options invalid;
UNIX 03 and POSIX.1-2001 applications      require the use of c99"
gmake[2]: *** [getopt1.o] Error 1
gmake[2]: Leaving directory `/home/beckerjes/ganglia/ganglia-3.1.1/lib'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/home/beckerjes/ganglia/ganglia-3.1.1'
gmake: *** [all] Error 2


The ./configure command is uninteresting:  
LDFLAGS=-L/usr/local/rrdtool-1.2.19/lib
CFLAGS=-I/usr/local/rrdtool-1.2.19/include ./configure --enable-status
--with-libapr=/usr/local/apr --with-gmetad --prefix=/usr/local/ganglia

the C99 flag is meant to be added by configure when evaluating the
AC_PROG_CC_STDC, but version 2.59 of autoconf that is used to bootstrap the
release package didn't, generating this problem.

re-bootstrapping the package with a newer version of the autotools (as provided
by Solaris 10) could be used to solve the problem.

as indicated before, adding :

  CFLAGS="-std=c99"

is a usable workaround as well until the bootstrapping could be done for
releases with something less obsolete than CentOS 4

to avoid a bug in Solaris headers while building libmetrics it would be better
to use instead :

  CFLAGS="-std=gnu99"

ommitted revision 2125 for trunk