On 5 February 2013 18:15, Markus Elfring wrote: > elfring@Sonne:~/Projekte/OpalVoip/OPAL/Probe> LANG=C g++ -o Video1 -Wall -Wextra > -Wstrict-aliasing -Wfloat-equal -Wno-comment -Wno-unused -Winit-self > -Wno-missing-field-initializers -Wreorder -felide-constructors -fexceptions > -fPIC -DP_64BIT -DPTRACING=1 -D_REENTRANT -D_GNU_SOURCE=1 -I/usr/local/include > -I/usr/include/SDL -L/usr/local/lib64 -lpt_s -lrt -lsasl2 -lldap -llber -lldap_r > -lssl -lcrypto -lexpat -llua -lSDL -lpthread -lodbc -lresolv -ldl Video1.cpp This command is invalid, the libraries should come after the files that refer to the symbols in the library.