nginx$ make
ended with 
Undefined symbols for architecture x86_64: 
"_pcre_free_study", referenced from: 
_ngx_pcre_free_studies in ngx_regex.o 
ld: symbol(s) not found for architecture x86_64 

due to /usr/lib/libpcre.dylib is wrong version and linked before installed /usr/local/lib/libpcre.dylib 

pcre-8.31$ sudo make uninstall 

pcre-8.31$ ./configure --prefix=/usr