Error building curl with openssl via pkgconfig #2848
Description
I did this
PKG_CONFIG_PATH=/opt/WP/common.libs/lib/pkgconfig ./configure --with-ssl
I expected the following
Curl will be configured to build with SSL support.
OpenSSL is installed in custom path.
what happened
configure script does not report SSL (HTTPS, FTPS, ...) support:
configure: Configured to build curl/libcurl:
curl version: 7.61.0
SSL support: no
Protocols: DICT FILE FTP GOPHER HTTP IMAP POP3 RTSP SMTP TELNET TFTP
OpenSSL static libraries are installed in custom path via ./config --prefix=/opt/WP/common.libs --openssldir=/opt/WP/common.libs no-shared -fPIC
pkgconfig files are also installed in /opt/WP/common.libs/lib/pkgconfig/libssl.pc:
prefix=/opt/WP/common.libs
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: OpenSSL-libssl
Description: Secure Sockets Layer and cryptography libraries
Version: 1.1.0h
Requires.private: libcrypto
Libs: -L${libdir} -lssl
Cflags: -I${includedir}
curl's config.log shows missing 'pthread':
configure:22454: checking for openssl options with pkg-config
configure:22468: result: found
configure:22497: pkg-config: SSL_LIBS: "-lssl -lcrypto "
configure:22499: pkg-config: SSL_LDFLAGS: "-L/opt/WP/common.libs/lib "
configure:22501: pkg-config: SSL_CPPFLAGS: "-I/opt/WP/common.libs/include "
configure:22513: checking for HMAC_Update in -lcrypto
configure:22535: gcc -o conftest -Werror-implicit-function-declaration -O2 -Wno-system-headers -I/opt/WP/common.libs/include -L/opt/WP/common.libs/lib conftest.c -lcrypto -lssl -lcrypto -lz >&5
/opt/WP/common.libs/lib/libcrypto.a(threads_pthread.o): In function `CRYPTO_THREAD_lock_new':
threads_pthread.c:(.text+0x25): undefined reference to `pthread_rwlock_init'
curl/libcurl version
curl-7.61.0
operating system
openssl-1.1.0h
CentOS Linux release 7.5.1804 (Core)