Hi, Im trying to build fred-epp on fedora15 (lovelock) via rpmbuild, on this fred-mod-eppd-2.3.2-1.fc12.src.rpm, I have successfully build fred-client-2.2.3-1.noarch.rpm, fred-db-2.3.0-1.noarch.rpm, fred-doc2pdf-2.0.4-1.noarch.rpm, when I tried to build the fred-mod-eppd, it prompts me the error: "checking for pkg-config... (cached) /usr/bin/pkg-config "checking for X509_digest in -lssl... no "configure: error: openssl not found "error: Bad exit status from /var/tmp/rpm-tmp.I6w0pu (%build even if openssl and openssl-devel is already installed tried to check the BUILD/fred-mod-eppd/config.log it says: -unwind-tables conftest.c -lssl >&5 /usr/bin/ld: /tmp/ccbmNckH.o: undefined reference to symbol 'X509_digest' /usr/bin/ld: note: 'X509_digest' is defined in DSO /lib/libcrypto.so.10 so try adding it to the linker command line /lib/libcrypto.so.10: could not read symbols: Invalid operation collect2: ld returned 1 exit status tried to search google for some answer, saw some DSO linking, yet still cant understand, can someone help me solved this error. Thanks in advance. below are some info you might ask: [root@localhost fred-mod-eppd-2.3.2]# uname -a Linux localhost.localdomain 2.6.38.6-26.rc1.fc15.i686.PAE #1 SMP Mon May 9 20:36:50 UTC 2011 i686 i686 i386 GNU/Linux [root@localhost fred-mod-eppd-2.3.2]# cat /etc/redhat-release Fedora release 15 (Lovelock) [root@localhost fred-mod-eppd-2.3.2]# rpm -qa | grep openssl openssl-devel-1.0.0e-1.fc15.i686 openssl-1.0.0e-1.fc15.i686 configure:14340: result: /usr/bin/pkg-config configure:14371: checking for X509_digest in -lssl configure:14406: gcc -o conftest -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous -unwind-tables conftest.c -lssl >&5 /usr/bin/ld: /tmp/ccbmNckH.o: undefined reference to symbol 'X509_digest' /usr/bin/ld: note: 'X509_digest' is defined in DSO /lib/libcrypto.so.10 so try adding it to the linker command line /lib/libcrypto.so.10: could not read symbols: Invalid operation collect2: ld returned 1 exit status configure:14413: $? = 1 configure: failed program was: thanks val