search for: z_sin

Hi I have been looking at complex.c and want to access z_cos() and z_sin () from C in one of my packages. There doesn't seem to be a corresponding header file: there is no complex.h file. Where are the prototypes of z_sin() and z_cos() for these functions? grepping didn't help me: find ~/downloads/R-2.1.1/ -name "*.h " | xargs...

...exp' complex.o(.text+0xbf8): In function `z_sqrt': /usr/local/R-alpha/src/main/complex.c:439: undefined reference to `csqrt' complex.o(.text+0xc18): In function `z_cos': /usr/local/R-alpha/src/main/complex.c:486: undefined reference to `ccos' complex.o(.text+0xc38): In function `z_sin': /usr/local/R-alpha/src/main/complex.c:491: undefined reference to `csin' complex.o(.text+0xc5e): In function `z_tan': /usr/local/R-alpha/src/main/complex.c:497: undefined reference to `ctan' complex.o(.text+0xd26): In function `z_atan2': /usr/local/R-alpha/src/main/complex.c:5...