* installing *source* package 'threads' ...
** libs
gcc -I"/usr/local/R/R-devel/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c mutex.c -o mutex.o
gcc -I"/usr/local/R/R-devel/include" -DNDEBUG -I/usr/local/include -fpic -g -O2 -c threads.c -o threads.o
threads.c: In function 'ptest':
threads.c:193:3: warning: implicit declaration of function 'sleep' [-Wimplicit-function-declaration]
sleep(1);
^~~~~
gcc -shared -L/usr/local/R/R-devel/lib -L/usr/local/lib -o threads.so mutex.o threads.o -L/usr/local/R/R-devel/lib -lR
installing to /threads/libs
** R
** byte-compile and prepare package for lazy loading
** help
No man pages found in package 'threads'
*** installing help indices
** building package indices
** testing if installed package can be loaded
Error: package or namespace load failed for 'threads' in dyn.load(file, DLLpath = DLLpath, ...):
unable to load shared object '/threads/libs/threads.so':
/threads/libs/threads.so: undefined symbol: R_CollectFromIndex
Error: loading failed
Execution halted
ERROR: loading failed
* removing '/threads'