Configuring extensions
checking for OpenSSL support... no
checking for Kerberos support... no
checking for PCRE support... yes
checking for ZLIB support... yes
checking if the location of ZLIB install directory is defined... no
checking for gzgets in -lz... yes
checking whether to enable bc style precision math functions... no
checking for BZip2 support... no
checking whether to enable calendar conversion support... no
checking for cpdflib support... no
checking for CRACKlib support... no
checking whether to enable ctype functions... yes
checking for CURL support... no
checking for cyrus imap support... no
checking for xDBM support... no
checking whether to enable DBA... no
checking for GDBM support... no
checking for NDBM support... no
checking for Berkeley DB4 support... no
checking for Berkeley DB3 support... no
checking for Berkeley DB2 support... no
checking for DBM support... no
checking for CDB support... no
checking for INI File support... no
checking for FlatFile support... no
checking whether to enable DBA interface... no
checking whether to enable dbase support... no
checking whether to enable dbx support... no
checking whether to enable direct I/O support... no
checking for DOM support... no
checking for DOM XSLT support... no
checking for DOM EXSLT support... no
checking whether to enable EXIF (metadata from images) support... no
checking for FrontBase SQL92 (fbsql) support... no
checking for FDF support... no
checking whether to enable the bundled filePro support... no
checking for FriBidi support... no
checking whether to enable FTP support... no
checking for GD support... yes
checking for the location of libjpeg... yes
checking for the location of libpng... yes
checking for the location of libXpm... no
checking for FreeType 1.x support... no
checking for FreeType 2... yes
checking for T1lib support... no
checking whether to enable truetype string function in GD... yes
checking whether to enable JIS-mapped Japanese font support in GD... yes
checking for fabsf... yes
checking for floorf... yes
configure: error: libjpeg.(a|so) not found. (这个我正在下载jpegsrc.v6b.tar.gz 安装,其他的no是怎么回事?