diff --git a/Makefile b/Makefile
index ff48a20..6490932 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 CC=			gcc
 #CC=			clang --analyze
-CFLAGS=		-g -Wall -O2
+CFLAGS=		-g -Wall -O2 -Wno-unused-function
 WRAP_MALLOC=-DUSE_MALLOC_WRAPPERS
 AR=			ar
 DFLAGS=		-DHAVE_PTHREAD $(WRAP_MALLOC)
diff --git a/bwt.h b/bwt.h
index c36bf9b..d2ff0ac 100644
--- a/bwt.h
+++ b/bwt.h
@@ -96,14 +96,14 @@ extern "C" {
 
 	void bwt_bwtupdate_core(bwt_t *bwt);
 
-	inline bwtint_t bwt_occ(const bwt_t *bwt, bwtint_t k, ubyte_t c);
-	inline void bwt_occ4(const bwt_t *bwt, bwtint_t k, bwtint_t cnt[4]);
+	bwtint_t bwt_occ(const bwt_t *bwt, bwtint_t k, ubyte_t c);
+	void bwt_occ4(const bwt_t *bwt, bwtint_t k, bwtint_t cnt[4]);
 	bwtint_t bwt_sa(const bwt_t *bwt, bwtint_t k);
 
 	// more efficient version of bwt_occ/bwt_occ4 for retrieving two close Occ values
 	void bwt_gen_cnt_table(bwt_t *bwt);
-	inline void bwt_2occ(const bwt_t *bwt, bwtint_t k, bwtint_t l, ubyte_t c, bwtint_t *ok, bwtint_t *ol);
-	inline void bwt_2occ4(const bwt_t *bwt, bwtint_t k, bwtint_t l, bwtint_t cntk[4], bwtint_t cntl[4]);
+	void bwt_2occ(const bwt_t *bwt, bwtint_t k, bwtint_t l, ubyte_t c, bwtint_t *ok, bwtint_t *ol);
+	void bwt_2occ4(const bwt_t *bwt, bwtint_t k, bwtint_t l, bwtint_t cntk[4], bwtint_t cntl[4]);
 
 	int bwt_match_exact(const bwt_t *bwt, int len, const ubyte_t *str, bwtint_t *sa_begin, bwtint_t *sa_end);
 	int bwt_match_exact_alt(const bwt_t *bwt, int len, const ubyte_t *str, bwtint_t *k0, bwtint_t *l0);
diff --git a/bwt_lite.c b/bwt_lite.c
index 6cd3b1d..9b47270 100644
--- a/bwt_lite.c
+++ b/bwt_lite.c
@@ -56,7 +56,7 @@ bwtl_t *bwtl_seq2bwtl(int len, const uint8_t *seq)
 	}
 	return b;
 }
-inline uint32_t bwtl_occ(const bwtl_t *bwt, uint32_t k, uint8_t c)
+uint32_t bwtl_occ(const bwtl_t *bwt, uint32_t k, uint8_t c)
 {
 	uint32_t n, b;
 	if (k == bwt->seq_len) return bwt->L2[c+1] - bwt->L2[c];
diff --git a/bwt_lite.h b/bwt_lite.h
index 0096b93..4fadcce 100644
--- a/bwt_lite.h
+++ b/bwt_lite.h
@@ -17,9 +17,9 @@ extern "C" {
 #endif
 
 	bwtl_t *bwtl_seq2bwtl(int len, const uint8_t *seq);
-	inline uint32_t bwtl_occ(const bwtl_t *bwt, uint32_t k, uint8_t c);
-	inline void bwtl_occ4(const bwtl_t *bwt, uint32_t k, uint32_t cnt[4]);
-	inline void bwtl_2occ4(const bwtl_t *bwt, uint32_t k, uint32_t l, uint32_t cntk[4], uint32_t cntl[4]);
+	uint32_t bwtl_occ(const bwtl_t *bwt, uint32_t k, uint8_t c);
+	void bwtl_occ4(const bwtl_t *bwt, uint32_t k, uint32_t cnt[4]);
+	void bwtl_2occ4(const bwtl_t *bwt, uint32_t k, uint32_t l, uint32_t cntk[4], uint32_t cntl[4]);
 	void bwtl_destroy(bwtl_t *bwt);
 
 #ifdef __cplusplus