Requires pthread linker but is not present in Makefile [w/ fix]

[Bryan Paddock]

Simple problem but people who don't know better may not be able to fix it so easily.

Seems you're using pthreads but the Makefile doesn't contain the -lpthreads

After doing a make on a download/untar I got this:

gcc src/ttymidi.c -o ttymidi -lasound
/usr/bin/ld: /tmp/cc1Eaxfg.o: undefined reference to symbol 'pthread_create@@GLIBC_2.1'
/usr/bin/ld: note: 'pthread_create@@GLIBC_2.1' is defined in DSO /usr/lib/libpthread.so.0 so try adding it to the linker command line
/usr/lib/libpthread.so.0: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make: *** [all] Error 1

Simply added "-lpthread" to Makefile fixed it.

--- Makefile 2012-02-01 21:56:20.000000000 +0200
+++ fixed/Makefile 2012-11-15 16:27:32.000000000 +0200
@@ -1,5 +1,5 @@
 all:
- gcc src/ttymidi.c -o ttymidi -lasound
+ gcc src/ttymidi.c -o ttymidi -lasound -lpthread
 clean:
  rm ttymidi
 install:

[Johannes Keyser (johanneskeyser)]

Thanks a lot Bryan, I was one of those that don't know better, and it took me some time to figure this out!

[Craig Barnes (cjbarnes18)]

Is this project still being maintained here?

[Peter van de Pol (peter-rozenbottels)]

Question is: how do I do this? I am not a programmer... Any help appreciated.

[Brian Fay (ovaltinevortex)]

Peter, open the file called "Makefile" in a text editor.

There is a line that says:
gcc src/ttymidi.c -o ttymidi -lasound

Change it to:
gcc src/ttymidi.c -o ttymidi -lasound -lpthread

Then try running "make" again (I think that part is in the instructions?)

[Stemby (carlo-stemberger)]

Thank you for the tip!