Same error using perl 5.12 from MacPorts:

$ ./configure --prefix=/usr/local --with-cc-opt="-I/usr/local/include -O2 -Wno-deprecated-declarations" --with-ld-opt="-L/usr/local/lib" --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx/nginx.pid --lock-path=/var/run/nginx/nginx.lock --http-client-body-temp-path=/var/run/nginx/client_body_temp --http-proxy-temp-path=/var/run/nginx/proxy_temp --http-fastcgi-temp-path=/var/run/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/run/nginx/uwsgi_temp --with-http_dav_module --with-http_flv_module --with-mail --with-http_ssl_module --with-mail_ssl_module --with-http_stub_status_module --with-ipv6 --with-http_perl_module --with-perl=/usr/bin/perl --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_gzip_static_module --with-perl=/opt/local/bin/perl
. . .
checking for perl
+ perl version: This is perl 5, version 12, subversion 3 (v5.12.3) built for darwin-multi-2level
+ perl interpreter multiplicity found
. . .

$ make
. . .
gcc -c -pipe -O -W -Wall -Wpointer-arith -Wno-unused-parameter -Wunused-function -Wunused-variable -Wno-unused-value -Werror -g -I/usr/local/include -O2 -Wno-deprecated-declarations -pipe -O2 -arch x86_64 -fno-common -DPERL_DARWIN -I/opt/local/include -no-cpp-precomp -fno-strict-aliasing -fstack-protector -I/opt/local/include -I/opt/local/lib/perl5/5.12.3/darwin-multi-2level/CORE -I src/core -I src/event -I src/event/modules -I src/os/unix -I /opt/local/include -I objs -I src/http -I src/http/modules -I src/http/modules/perl \
-o objs/src/http/modules/perl/ngx_http_perl_module.o \
src/http/modules/perl/ngx_http_perl_module.c
In file included from src/http/modules/perl/ngx_http_perl_module.h:17,
from src/http/modules/perl/ngx_http_perl_module.c:10:
/opt/local/lib/perl5/5.12.3/darwin-multi-2level/CORE/perl.h:3336: error: expected specifier-qualifier-list before ‘bool’
. . .

Actually I started with the MacPorts nginx 1.0.6 install and then tried the tarball (getting the same result).

Frosty