diff --git a/Makefile b/Makefile
index 9f4f4b76f..d9417221f 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ REGRESS = $(EXTENSION)
 
 DATA = pipelinedb--1.0.0.sql
 EXTRA_CLEAN = src/test/regress/expected/$(REGRESS).out src/test/regress/sql/$(REGRESS).sql
-SHLIB_LINK += /usr/lib/libzmq.a -lstdc++
+SHLIB_LINK += -lzmq -lstdc++ -fPIC
 
 ifdef USE_PGXS
 PG_CPPFLAGS += -I./include -I$(shell $(PG_CONFIG) --includedir)
diff --git a/src/scheduler.c b/src/scheduler.c
index 9485829f6..551589bce 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -6,7 +6,9 @@
  *
  *-------------------------------------------------------------------------
  */
+#ifdef GLIBC
 #include <execinfo.h>
+#endif
 #include <math.h>
 #include <sys/resource.h>
 #include <time.h>
@@ -126,6 +128,7 @@ ContQueryDatabaseMetadataSize(void)
 void
 debug_segfault(SIGNAL_ARGS)
 {
+#ifdef GLIBC
 	void *array[32];
 	size_t size = backtrace(array, 32);
 	fprintf(stderr, "Segmentation fault (PID %d)\n", MyProcPid);
@@ -134,6 +137,7 @@ debug_segfault(SIGNAL_ARGS)
 	fprintf(stderr, "query: %s\n", debug_query_string);
 	fprintf(stderr, "backtrace:\n");
 	backtrace_symbols_fd(array, size, STDERR_FILENO);
+#endif
 
 #ifdef SLEEP_ON_ASSERT