Trying to install 0.99.31 on ubuntu 20.04 and 18.04 and get the same errors at the configure stage : configure: error: Package requirements (gtk+-2.0 >= 2.10 libgnomeui-2.0 >= 2.10 cairo) were not met: No package 'gtk+-2.0' found No package 'libgnomeui-2.0' found No package 'cairo' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables LINSMITH_CFLAGS and LINSMITH_LIBS to avoid the...