Problem compiling with RedHat 7

I get a segmentation fault when it seems to try read the
/usr/include/gconv.h file. Any ideas?

make[3]: Entering directory
`/var/ftp/incoming/postgresql-7.0.2/src/backend/access/nbtree'
gcc -I../../../include -I../../../backend   -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -I../..    -c -o nbtcompare.o nbtcompare.c
gcc -I../../../include -I../../../backend   -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -I../..    -c -o nbtinsert.o nbtinsert.c
gcc -I../../../include -I../../../backend   -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -I../..    -c -o nbtpage.o nbtpage.c
gcc -I../../../include -I../../../backend   -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -I../..    -c -o nbtree.o nbtree.c
gcc -I../../../include -I../../../backend   -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -I../..    -c -o nbtscan.o nbtscan.c
gcc -I../../../include -I../../../backend   -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -I../..    -c -o nbtsearch.o nbtsearch.c
gcc -I../../../include -I../../../backend   -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -I../..    -c -o nbtstrat.o nbtstrat.c
gcc -I../../../include -I../../../backend   -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -I../..    -c -o nbtutils.o nbtutils.c
gcc -I../../../include -I../../../backend   -O2 -Wall -Wmissing-prototypes
-Wmissing-declarations -I../..    -c -o nbtsort.o nbtsort.c
In file included from /usr/include/_G_config.h:45,
 from /usr/include/libio.h:31,
                 from /usr/include/stdio.h:58,
                 from ../../../include/c.h:51,
                 from ../../../include/postgres.h:41,
                 from nbtsort.c:37:
/usr/include/gconv.h:164: Internal error: Segmentation fault.
Please submit a full bug report.