Solaris

# ldd /usr/local/bin/php | grep curl
        libcurl.so.4 =>  /usr/local/lib/libcurl.so.4
#

# more ConfigurePHP
#!/bin/sh

#PATH=/opt/SUNWspro/bin:/usr/bin:/usr/ccs/bin:/usr/sbin:/usr/sfw/bin; export PATH
PATH=/opt/SUNWspro/bin:/usr/local/bin:/usr/bin:/usr/ccs/bin:/usr/sfw/bin:/usr/dt
/bin:/usr/openwin/bin:/usr/sbin; export PATH
LD_RUN_PATH=/usr/local/curl-7.19.5/lib:/usr/sfw/lib:/usr/local/lib; export LD_RUN_PATH

env     CC=cc CXX=CC  \
        ./configure \
        --with-apxs2=/usr/local/apache2/bin/apxs \
        --with-mysql=/usr/local/mysql \
        --with-pear \
        --with-libxml-dir=/usr \
        --with-mysqli=/usr/local/mysql/bin/mysql_config \
        --enable-mbstring \
        --with-curl=/usr/local/curl-7.19.5 \
        --with-gd \
        --with-jpeg \
        --with-jpeg-dir=/usr/lib

#!/end
#

# php -i | grep curlConfigure Command =>  './configure' '--with-apxs2=/usr/local/apache2/bin/apxs' '--with-mysql=/usr/local/mysql' '--with-pear' '--with-libxml-dir=/usr' '--with-mysqli=/usr/local/mysql/bin/mysql_config' '--enable-mbstring' '--with-curl=/usr/local/curl-7.19.5' '--with-gd' '--with-jpeg' '--with-jpeg-dir=/usr/lib'