Hi: I don't know if it is a bug or what? I followed instructions. Jean R version: R-2.2.1 OS: Linux RedHat 9 I followed the instructions. tar -xvf, configure, then make. I get these error messages at the end of make and with make check. ==================================================================================================================================In file included from rbitmap.c:45: /usr/include/png.h:318:18: zlib.h: No such file or directory In file included from /usr/include/png.h:321, from rbitmap.c:45: /usr/include/pngconf.h:1091: error: parse error before '*' token /usr/include/pngconf.h:1092: error: parse error before '*' token /usr/include/pngconf.h:1093: error: parse error before '*' token In file included from rbitmap.c:45: /usr/include/png.h:1034: error: parse error before "z_stream" /usr/include/png.h:1262: error: parse error before '}' token /usr/include/png.h:1821: error: parse error before "png_zalloc" /usr/include/png.h:1821: error: parse error before "png_ptr" /usr/include/png.h:1825: error: parse error before "png_ptr" rbitmap.c: In function `my_png_error': rbitmap.c:72: error: dereferencing pointer to incomplete type rbitmap.c: In function `R_SaveAsPng': rbitmap.c:121: error: dereferencing pointer to incomplete type make[4]: *** [rbitmap.lo] Error 1 make[4]: Target `R_X11.so' not remade because of errors. make[4]: Leaving directory `/users/cadet/R-2.2.1/src/modules/X11' make[3]: *** [R] Error 2 make[3]: Leaving directory `/users/cadet/R-2.2.1/src/modules/X11' make[2]: *** [R] Error 1 make[2]: Leaving directory `/users/cadet/R-2.2.1/src/modules' make[1]: *** [R] Error 1 make[1]: Leaving directory `/users/cadet/R-2.2.1/src' make: *** [R] Error 1 make: Target `all' not remade because of errors. giant {122} make check make[1]: Entering directory `/users/cadet/R-2.2.1/tests' make[2]: Entering directory `/users/cadet/R-2.2.1/tests' make[3]: Entering directory `/users/cadet/R-2.2.1/tests/Examples' make[4]: Entering directory `/users/cadet/R-2.2.1/tests/Examples' make[4]: `Makedeps' is up to date. make[4]: Leaving directory `/users/cadet/R-2.2.1/tests/Examples' make[4]: Entering directory `/users/cadet/R-2.2.1/tests/Examples' make[4]: *** No rule to make target `../../src/library/base/all.R', needed by `base-Ex.Rout'. Stop. make[4]: Leaving directory `/users/cadet/R-2.2.1/tests/Examples' make[3]: *** [test-Examples-Base] Error 2 make[3]: Leaving directory `/users/cadet/R-2.2.1/tests/Examples' make[2]: *** [test-Examples] Error 2 make[2]: Leaving directory `/users/cadet/R-2.2.1/tests' make[1]: *** [test-all-basics] Error 1 make[1]: Leaving directory `/users/cadet/R-2.2.1/tests' make: *** [check] Error 2 ====================================================================================================================== --