diff --git a/src/external/sds.h b/src/external/sds.h
index 1bdb60d..adcc12c 100644
--- a/src/external/sds.h
+++ b/src/external/sds.h
@@ -34,7 +34,7 @@
 #define __SDS_H
 
 #define SDS_MAX_PREALLOC (1024*1024)
-const char *SDS_NOINIT;
+extern const char *SDS_NOINIT;
 
 #include <sys/types.h>
 #include <stdarg.h>
diff --git a/src/pmdas/cifs/pmda.c b/src/pmdas/cifs/pmda.c
index 84fb50f..9240e3d 100644
--- a/src/pmdas/cifs/pmda.c
+++ b/src/pmdas/cifs/pmda.c
@@ -25,8 +25,8 @@ static int _isDSO = 1; /* for local contexts */
 
 static char *cifs_procfsdir = "/proc/fs/cifs";
 static char *cifs_statspath = "";
-unsigned int global_version_major;
-unsigned int global_version_minor;
+extern unsigned int global_version_major;
+extern unsigned int global_version_minor;
 
 pmdaIndom indomtable[] = {
     { .it_indom = CIFS_FS_INDOM },
diff --git a/src/pmdas/perfevent/configparser.h b/src/pmdas/perfevent/configparser.h
index 4f504ea..c6726f2 100644
--- a/src/pmdas/perfevent/configparser.h
+++ b/src/pmdas/perfevent/configparser.h
@@ -69,9 +69,9 @@ typedef struct configuration {
     pmcdynamic_t *dynamicpmc;
 } configuration_t;
 
-int context_newpmc;
-int context_derived;        /* A flag to check the current pmc */
-int context_dynamic;        /* check the current dynamic pmc */
+extern int context_newpmc;
+extern int context_derived;        /* A flag to check the current pmc */
+extern int context_dynamic;        /* check the current dynamic pmc */
 
 /* \brief parse the perf event configuration file
  * This function allocates memory. The returned object should be passed to
diff --git a/src/pmdas/perfevent/configparser.l b/src/pmdas/perfevent/configparser.l
index bb139fe..fbdaeca 100644
--- a/src/pmdas/perfevent/configparser.l
+++ b/src/pmdas/perfevent/configparser.l
@@ -20,6 +20,10 @@
 %{
 #include "configparser.h"
 
+int context_newpmc;
+int context_derived;
+int context_dynamic;
+
 static int is_derived(char *name)
 {
     char *str = NULL;
diff --git a/src/pmdas/perfevent/parse_events.c b/src/pmdas/perfevent/parse_events.c
index efe356f..f6d1a7b 100644
--- a/src/pmdas/perfevent/parse_events.c
+++ b/src/pmdas/perfevent/parse_events.c
@@ -18,6 +18,8 @@
 #include "parse_events.h"
 #include "perfinterface.h"
 
+char dev_dir[PATH_MAX];   /* Optional path prefix for the PMU devices */
+
 static void cleanup_property(struct property *prop)
 {
     if (!prop)
diff --git a/src/pmdas/perfevent/parse_events.h b/src/pmdas/perfevent/parse_events.h
index 4e09496..8f7a393 100644
--- a/src/pmdas/perfevent/parse_events.h
+++ b/src/pmdas/perfevent/parse_events.h
@@ -80,11 +80,11 @@ struct software_event {
     unsigned long long config;
 };
 
-char dev_dir[PATH_MAX];   /* Optional path prefix for the PMU devices */
+extern char dev_dir[];   /* Optional path prefix for the PMU devices */
 
-int init_dynamic_events(struct pmu **pmu_list);
-void setup_cpu_config(struct pmu *pmu_ptr, int *ncpus, int **cpuarr);
-int get_file_string(char *path, char *buf);
-void cleanup_pmu_list(struct pmu *pmu);
+extern int init_dynamic_events(struct pmu **pmu_list);
+extern void setup_cpu_config(struct pmu *pmu_ptr, int *ncpus, int **cpuarr);
+extern int get_file_string(char *path, char *buf);
+extern void cleanup_pmu_list(struct pmu *pmu);
 
 #endif /* PARSE_EVENTS_H_ */