compilation fails with the following on Centos 4.3/x86-64

./configure --prefix=/usr/local/site/nginx --with-cc-opt=-"I /usr/include/pcre" --with-ld-opt="-L/usr/lib64 -L/lib64"

gcc -c -O -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Wno-unused-function -Wunused-variable -Wunused-value -Werror -g -I /usr/include/pcre -I src/core -I src/event -I src/event/modules -I src/os/unix -I objs -I src/http -I src/http/modules \ -o objs/src/http/ngx_http_request_body.o \ src/http/ngx_http_request_body.c

src/http/ngx_http_request_body.c: In function `ngx_http_read_client_request_body': src/http/ngx_http_request_body.c:95: warning: comparison between signed and unsigned src/http/ngx_http_request_body.c:123: warning: comparison between signed and unsigned src/http/ngx_http_request_body.c: In function `ngx_http_do_read_client_request_body': src/http/ngx_http_request_body.c:245: warning: comparison between signed and unsigned make[1]: *** [objs/src/http/ngx_http_request_body.o] Error 1

make: *** [build] Error 2