diff --git a/BasiliskII/src/Unix/configure.ac b/BasiliskII/src/Unix/configure.ac
index 3991db2ac..93682afb2 100644
--- a/BasiliskII/src/Unix/configure.ac
+++ b/BasiliskII/src/Unix/configure.ac
@@ -596,7 +596,7 @@ fi
 
 dnl Checks for library functions.
 AC_CHECK_FUNCS(strdup strerror cfmakeraw)
-AC_CHECK_FUNCS(clock_gettime timer_create)
+AC_CHECK_FUNCS(clock_gettime clock_nanosleep timer_create)
 AC_CHECK_FUNCS(sigaction signal)
 AC_CHECK_FUNCS(mmap mprotect munmap)
 AC_CHECK_FUNCS(vm_allocate vm_deallocate vm_protect)
diff --git a/BasiliskII/src/timer.cpp b/BasiliskII/src/timer.cpp
index 573abc77c..243f38549 100644
--- a/BasiliskII/src/timer.cpp
+++ b/BasiliskII/src/timer.cpp
@@ -27,6 +27,7 @@
 #ifdef PRECISE_TIMING_POSIX
 #include <pthread.h>
 #include <semaphore.h>
+#include <signal.h>
 #endif
 
 #ifdef PRECISE_TIMING_MACH