<previous successful configure output>
...
checking for Oracle-ORACLE support... no
checking for Ovrimos SQL Server support... no
checking whether to include PCRE support... yes
checking for memmove... (cached) yes
checking whether to include Pdflib 3.x support... /usr/local/web/support/php4
yes
checking for libz needed by pdflib 3.x... already zlib support
checking for jpeg_read_header in -ljpeg... (cached) yes
checking for png_create_info_struct in -lpng... no
no
checking for TIFFOpen in -ltiff... no
no
checking for PDF_show_boxed in -lpdf... no
configure: error: pdflib extension requires pdflib 3.x.

<notice lines six and seven above - the path after "checking whether to include Pdflib 3.x support"
and the "yes" response on the next (seventh) line>

another configure output:

checking whether to include ttf support... yes
checking for T1lib support... checking for T1_GetExtend in -lt1... yes
yes
checking whether to enable 4bit antialias hack with FreeType2... yes
checking whether to include GNU gettext support... no
checking for Hyperwave support... no
checking for ICAP support... no
checking for Kerberos support in IMAP... no
checking for SSL support in IMAP... no
checking for IMAP support... yes
checking for Informix support... no
checking for Ingres II support... no
checking for InterBase support... yes
checking for Java support... yes
checking whether to include LDAP support... yes
checking for MCAL support... yes
checking for mcrypt support... yes
checking for init_mcrypt in -lmcrypt... no
checking for mcrypt_module_open in -lmcrypt... no
configure: error: Sorry

notice the extra "<CR> yes" after line 2

my configure

./configure --prefix=/usr/local/web/support/php4 \
--enable-discard-path \
--with-config-file-path=/usr/local/web/support/php4/etc \
--enable-sigchild \
--enable-magic-quotes \
--enable-safe-mode \
--with-exec-dir=/usr/local/web/support/php4/safebin \
--with-nsapi=/usr/local/web/suitespot \
--enable-bcmath \
--enable-calendar \
--enable-xml \
--enable-exif \
--enable-ftp \
--enable-shmop \
--enable-sockets \
--with-regex=php \
--enable-sysvsem \
--enable-sysvshm \
--enable-wddx \
--enable-trans-sid \
--enable-yp \
--with-zlib-dir=/usr/local/web/support/php4 \
--with-tiff-dir=/usr/local/web/support/php4 \
--with-jpeg-dir=/usr/local/web/support/php4 \
--with-png-dir=/usr/local/web/support/php4 \
--with-t1lib=/usr/local/web/support/php4 \
--with-ttf=/usr/local/web/support/php4 \
--enable-freetype-4bit-antialias-hack \
--with-curl=/usr/local/web/support/php4 \
--with-gdbm=/usr/local/web/support/php4 \
--with-db3=/usr/local/web/support/php4 \
--with-dom=/usr/local/web/support/php4 \
--with-fdftk=/usr/local/web/support/php4 \
--with-gd=/usr/local/web/support/php4 \
--with-pdflib=/usr/local/web/support/php4 \
--with-imap=/usr/local/web/support/php4 \
--with-interbase=/usr/local/web/support/php4 \
--with-ldap=/usr/local/web/support/php4 \
--with-mcal=/usr/local/web/support/php4 \
--with-mhash=/usr/local/web/support/php4 \
--with-mysql=/usr/local/web/support/php4 \
--with-iodbc=/usr/local/web/support/php4 \
--with-yaz=/usr/local/web/support/php4 \
--with-zlib=/usr/local/web/support/php4 \
--with-ming=/usr/local/web/support/php4 \
--with-java=/usr/local/web/support/jdk