Undefined reference to 'dlclose' Solution

Make [1]: Entering directory '/usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ g2' Gcc-I/usr/local/include-I. /confparser-I. /include-o csfd server. o protocol. o data. o mempool. o pipeline. o common. o main. o module. o monitor. o log. o-Wl-L/usr/local/lib-L. /confparser-lconfparser-levent-lpthread Main. o: In function 'config _ exec ': /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/main. c: 319: undefined reference to 'dlclose' Module. o: In function 'Load _ protocol_mod ': /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 51: undefined reference to 'dlopen' /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 53: undefined reference to 'dlerror' /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 57: undefined reference to 'dlsym' /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 59: undefined reference to 'dlerror' Module. o: In function 'init _ mod_config ': /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 113: undefined reference to 'dlopen' /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 115: undefined reference to 'dlerror' /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 120: undefined reference to 'dlsym' /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 123: undefined reference to 'dlerror' /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 127: undefined reference to 'dlclose' /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 136: undefined reference to 'dlclose' /Usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ G2/module. c: 144: undefined reference to 'dlclose' Collect2: ld returned 1 exit status Make [1]: *** [csfd] Error 1 Make [1]: Leaving directory '/usr/local/sinasrv/PyCSF-1.0_Alpha_3@CSF-3.1.2 _ g2' Make: *** [update] Error 1 Cause: Add-ldl to dlopen files during compilation Add the following-ldl option to the LDFLAGS =-L/usr/local/lib-L./confparser-lconfparser-levent-lpthread-ldl column in Makefile. in   It cannot be added under lib/in the project. Libmysql. so Libmysql. so.16 Libmysql. so.16.0.0 Libmysqlclient. Libmysqlclient. so Libmysqlclient_r.so