Esta discussão resolveu o problema link
Ele pode ser instalado a partir deste link
do PPA Eu tentei instalar o Gnuplot-4.6.4 no Ubuntu 12.04 depois de seguir link mas deu o seguinte erro após sudo make
In file included from wxterminal/wxt_gui.cpp:96:0: wxterminal/wxt_gui.h:161:3: error: #error "wxt does not know if this platform has to be mono- or multi-threaded" wxterminal/wxt_gui.cpp: In function ‘bool wxt_exec_event(int, int, int, int, int, wxWindowID)’: wxterminal/wxt_gui.cpp:3331:7: error: ‘wxt_sendevent_fd’ was not declared in this scope wxterminal/wxt_gui.cpp:3336:13: error: ‘wxt_sendevent_fd’ was not declared in this scope wxterminal/wxt_gui.cpp: In function ‘void wxt_atexit()’: wxterminal/wxt_gui.cpp:3593:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] wxterminal/wxt_gui.cpp:3594:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
Como instalá-lo?