compiling tests/hello_world_gles_deriv.c

The file "sincos.h" does not appear in the tests directory, but is needed by hello_world_gles_deriv.c.

./emcc tests/hello_world_gles_deriv.c -o hello_world_gles_deriv.html
tests/hello_world_gles_deriv.c:58:10: fatal error: 'sincos.h' file not found
#include "sincos.h"
^~~~~~~~~~
1 error generated.
emcc: error: '/home/max/Archimedes/emsdk/upstream/bin/clang -DEMSCRIPTEN -fignore-exceptions -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr -Xclang -isystem/home/max/Archimedes/emsdk/upstream/emscripten/system/include/SDL -target wasm32-unknown-emscripten -D__EMSCRIPTEN_major__=2 -D__EMSCRIPTEN_minor__=0 -D__EMSCRIPTEN_tiny__=11 -D_LIBCPP_ABI_VERSION=2 -Dunix -D__unix -D__unix__ -Werror=implicit-function-declaration --sysroot=/home/max/Archimedes/emsdk/upstream/emscripten/system -Xclang -isystem/home/max/Archimedes/emsdk/upstream/emscripten/cache/wasm/include -Xclang -iwithsysroot/include/compat -Xclang -iwithsysroot/include/libc -Xclang -iwithsysroot/lib/libc/musl/arch/emscripten -Xclang -iwithsysroot/local/include -Xclang -iwithsysroot/include/SSE -Xclang -iwithsysroot/include/neon -Xclang -iwithsysroot/lib/compiler-rt/include -Xclang -iwithsysroot/lib/libunwind/include -o hello_world_gles_deriv.html tests/hello_world_gles_deriv.c -c -o /tmp/emscripten_temp_v_c10jxq/hello_world_gles_deriv_0.o' failed (1)