[Users] compile error

Hi all, I am compile openser-1.0.0-tls on Red Hat Linux 3.2.3-52 openssl-0.9.7a-33.17 openssl-devel-0.9.7a-33.17 It's show error : gcc -g -O9 -funroll-loops -Wcast-align -Wall -minline-all-stringops -malign-double -falign-loops -mcpu=athlon -DNAME='"openser"' -DVERSION='"1.0.0-tls"' -DARCH='"i386"' -DOS='"linux"' -DCOMPILER='"gcc 3.2"' -D__CPU_i386 -D__OS_linux -DCFG_DIR='"/usr/local/etc/openser/"' -DPKG_MALLOC -DSHM_MEM -DSHM_MMAP -DDNS_IP_HACK -DUSE_IPV6 -DUSE_MCAST -DUSE_TCP -DDISABLE_NAGLE -DHAVE_RESOLV_RES -DF_MALLOC -DUSE_TLS -DFAST_LOCK -DADAPTIVE_WAIT -DADAPTIVE_WAIT_LOOPS=1024 -DHAVE_GETHOSTBYNAME2 -DHAVE_UNION_SEMUN -DHAVE_SCHED_YIELD -DHAVE_MSG_NOSIGNAL -DHAVE_MSGHDR_MSG_CONTROL -DHAVE_ALLOCA_H -I/usr/local/ssl/include -c main.c -o main.o In file included from /usr/include/openssl/ssl.h:179, from tls/tls_init.h:27, from main.c:112: /usr/include/openssl/kssl.h:72:18: krb5.h: No such file or directory In file included from /usr/include/openssl/ssl.h:179, from tls/tls_init.h:27, from main.c:112: /usr/include/openssl/kssl.h:134: syntax error before "krb5_enctype" /usr/include/openssl/kssl.h:136: syntax error before '*' token /usr/include/openssl/kssl.h:137: syntax error before '}' token /usr/include/openssl/kssl.h:149: syntax error before "kssl_ctx_setstring" /usr/include/openssl/kssl.h:149: syntax error before '*' token /usr/include/openssl/kssl.h:150: syntax error before '*' token /usr/include/openssl/kssl.h:151: syntax error before '*' token /usr/include/openssl/kssl.h:151: syntax error before '*' token /usr/include/openssl/kssl.h:152: syntax error before '*' token /usr/include/openssl/kssl.h:153: syntax error before "kssl_ctx_setprinc" /usr/include/openssl/kssl.h:153: syntax error before '*' token /usr/include/openssl/kssl.h:155: syntax error before "kssl_cget_tkt" /usr/include/openssl/kssl.h:155: syntax error before '*' token /usr/include/openssl/kssl.h:157: syntax error before "kssl_sget_tkt" /usr/include/openssl/kssl.h:157: syntax error before '*' token /usr/include/openssl/kssl.h:159: syntax error before "kssl_ctx_setkey" /usr/include/openssl/kssl.h:159: syntax error before '*' token /usr/include/openssl/kssl.h:161: syntax error before "context" /usr/include/openssl/kssl.h:162: syntax error before "kssl_build_principal_2" /usr/include/openssl/kssl.h:162: syntax error before "context" /usr/include/openssl/kssl.h:165: syntax error before "kssl_validate_times" /usr/include/openssl/kssl.h:165: syntax error before "atime" /usr/include/openssl/kssl.h:167: syntax error before "kssl_check_authent" /usr/include/openssl/kssl.h:167: syntax error before '*' token /usr/include/openssl/kssl.h:169: syntax error before "enctype" In file included from tls/tls_init.h:27, from main.c:112: /usr/include/openssl/ssl.h:909: syntax error before "KSSL_CTX" /usr/include/openssl/ssl.h:931: syntax error before '}' token make: *** [main.o] Error 1 Could you help me fix this problem ? Thank in advance! Best Regard.