diff --git a/bseq.c b/bseq.c
index e499ddae..e3e576fe 100644
--- a/bseq.c
+++ b/bseq.c
@@ -7,43 +7,43 @@
 #include "kseq.h"
 KSEQ_INIT(gzFile, gzread)
 
-struct bseq_file_s {
+struct mm_bseq_file_s {
 	int is_eof;
 	gzFile fp;
 	kseq_t *ks;
 };
 
-bseq_file_t *bseq_open(const char *fn)
+mm_bseq_file_t *mm_bseq_open(const char *fn)
 {
-	bseq_file_t *fp;
+	mm_bseq_file_t *fp;
 	gzFile f;
 	f = fn && strcmp(fn, "-")? gzopen(fn, "r") : gzdopen(fileno(stdin), "r");
 	if (f == 0) return 0;
-	fp = (bseq_file_t*)calloc(1, sizeof(bseq_file_t));
+	fp = (mm_bseq_file_t*)calloc(1, sizeof(mm_bseq_file_t));
 	fp->fp = f;
 	fp->ks = kseq_init(fp->fp);
 	return fp;
 }
 
-void bseq_close(bseq_file_t *fp)
+void mm_bseq_close(mm_bseq_file_t *fp)
 {
 	kseq_destroy(fp->ks);
 	gzclose(fp->fp);
 	free(fp);
 }
 
-bseq1_t *bseq_read(bseq_file_t *fp, int chunk_size, int with_qual, int *n_)
+mm_bseq1_t *mm_bseq_read(mm_bseq_file_t *fp, int chunk_size, int with_qual, int *n_)
 {
 	int size = 0, m, n;
-	bseq1_t *seqs;
+	mm_bseq1_t *seqs;
 	kseq_t *ks = fp->ks;
 	m = n = 0; seqs = 0;
 	while (kseq_read(ks) >= 0) {
-		bseq1_t *s;
+		mm_bseq1_t *s;
 		assert(ks->seq.l <= INT32_MAX);
 		if (n >= m) {
 			m = m? m<<1 : 256;
-			seqs = (bseq1_t*)realloc(seqs, m * sizeof(bseq1_t));
+			seqs = (mm_bseq1_t*)realloc(seqs, m * sizeof(mm_bseq1_t));
 		}
 		s = &seqs[n];
 		s->name = strdup(ks->name.s);
@@ -58,7 +58,7 @@ bseq1_t *bseq_read(bseq_file_t *fp, int chunk_size, int with_qual, int *n_)
 	return seqs;
 }
 
-int bseq_eof(bseq_file_t *fp)
+int mm_bseq_eof(mm_bseq_file_t *fp)
 {
 	return fp->is_eof;
 }
diff --git a/bseq.h b/bseq.h
index df9d5bbf..2d065f9e 100644
--- a/bseq.h
+++ b/bseq.h
@@ -3,19 +3,27 @@
 
 #include <stdint.h>
 
-struct bseq_file_s;
-typedef struct bseq_file_s bseq_file_t;
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct mm_bseq_file_s;
+typedef struct mm_bseq_file_s mm_bseq_file_t;
 
 typedef struct {
 	int l_seq, rid;
 	char *name, *seq, *qual;
-} bseq1_t;
+} mm_bseq1_t;
 
-bseq_file_t *bseq_open(const char *fn);
-void bseq_close(bseq_file_t *fp);
-bseq1_t *bseq_read(bseq_file_t *fp, int chunk_size, int with_qual, int *n_);
-int bseq_eof(bseq_file_t *fp);
+mm_bseq_file_t *mm_bseq_open(const char *fn);
+void mm_bseq_close(mm_bseq_file_t *fp);
+mm_bseq1_t *mm_bseq_read(mm_bseq_file_t *fp, int chunk_size, int with_qual, int *n_);
+int mm_bseq_eof(mm_bseq_file_t *fp);
 
 extern unsigned char seq_nt4_table[256];
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif
diff --git a/format.c b/format.c
index 048ca3eb..c927adb3 100644
--- a/format.c
+++ b/format.c
@@ -62,7 +62,7 @@ static inline void write_tags(kstring_t *s, const mm_reg1_t *r)
 	if (r->p) mm_sprintf_lite(s, "\tNM:i:%d\tms:i:%d\tAS:i:%d\tnn:i:%d", r->p->n_diff, r->p->dp_max, r->p->dp_score, r->p->n_ambi);
 }
 
-void mm_write_paf(kstring_t *s, const mm_idx_t *mi, const bseq1_t *t, const mm_reg1_t *r)
+void mm_write_paf(kstring_t *s, const mm_idx_t *mi, const mm_bseq1_t *t, const mm_reg1_t *r)
 {
 	s->l = 0;
 	mm_sprintf_lite(s, "%s\t%d\t%d\t%d\t%c\t", t->name, t->l_seq, r->qs, r->qe, "+-"[r->rev]);
@@ -105,7 +105,7 @@ static void sam_write_sq(kstring_t *s, char *seq, int l, int rev, int comp)
 	} else str_copy(s, seq, seq + l);
 }
 
-void mm_write_sam(kstring_t *s, const mm_idx_t *mi, const bseq1_t *t, const mm_reg1_t *r)
+void mm_write_sam(kstring_t *s, const mm_idx_t *mi, const mm_bseq1_t *t, const mm_reg1_t *r)
 {
 	int flag = 0;
 	s->l = 0;
diff --git a/index.c b/index.c
index 066a8915..6ec29a0b 100644
--- a/index.c
+++ b/index.c
@@ -190,13 +190,13 @@ static void mm_idx_post(mm_idx_t *mi, int n_threads)
 typedef struct {
 	int mini_batch_size, keep_name;
 	uint64_t batch_size, sum_len;
-	bseq_file_t *fp;
+	mm_bseq_file_t *fp;
 	mm_idx_t *mi;
 } pipeline_t;
 
 typedef struct {
     int n_seq;
-	bseq1_t *seq;
+	mm_bseq1_t *seq;
 	mm128_v a;
 } step_t;
 
@@ -217,7 +217,7 @@ static void *worker_pipeline(void *shared, int step, void *in)
         step_t *s;
 		if (p->sum_len > p->batch_size) return 0;
         s = (step_t*)calloc(1, sizeof(step_t));
-		s->seq = bseq_read(p->fp, p->mini_batch_size, 0, &s->n_seq); // read a mini-batch
+		s->seq = mm_bseq_read(p->fp, p->mini_batch_size, 0, &s->n_seq); // read a mini-batch
 		if (s->seq) {
 			uint32_t old_m, m;
 			uint64_t sum_len, old_max_len, max_len;
@@ -261,7 +261,7 @@ static void *worker_pipeline(void *shared, int step, void *in)
     } else if (step == 1) { // step 1: compute sketch
         step_t *s = (step_t*)in;
 		for (i = 0; i < s->n_seq; ++i) {
-			bseq1_t *t = &s->seq[i];
+			mm_bseq1_t *t = &s->seq[i];
 			mm_sketch(0, t->seq, t->l_seq, p->mi->w, p->mi->k, t->rid, p->mi->is_hpc, &s->a);
 			free(t->seq); free(t->name);
 		}
@@ -275,7 +275,7 @@ static void *worker_pipeline(void *shared, int step, void *in)
     return 0;
 }
 
-mm_idx_t *mm_idx_gen(bseq_file_t *fp, int w, int k, int b, int is_hpc, int mini_batch_size, int n_threads, uint64_t batch_size, int keep_name)
+mm_idx_t *mm_idx_gen(mm_bseq_file_t *fp, int w, int k, int b, int is_hpc, int mini_batch_size, int n_threads, uint64_t batch_size, int keep_name)
 {
 	pipeline_t pl;
 	memset(&pl, 0, sizeof(pipeline_t));
@@ -299,12 +299,12 @@ mm_idx_t *mm_idx_gen(bseq_file_t *fp, int w, int k, int b, int is_hpc, int mini_
 
 mm_idx_t *mm_idx_build(const char *fn, int w, int k, int is_hpc, int n_threads) // a simpler interface
 {
-	bseq_file_t *fp;
+	mm_bseq_file_t *fp;
 	mm_idx_t *mi;
-	fp = bseq_open(fn);
+	fp = mm_bseq_open(fn);
 	if (fp == 0) return 0;
 	mi = mm_idx_gen(fp, w, k, MM_IDX_DEF_B, is_hpc, 1<<18, n_threads, UINT64_MAX, 1);
-	bseq_close(fp);
+	mm_bseq_close(fp);
 	return mi;
 }
 
diff --git a/ksw2.h b/ksw2.h
index 41c0d9d7..a9256429 100644
--- a/ksw2.h
+++ b/ksw2.h
@@ -13,6 +13,10 @@
 #define KSW_EZ_EXTZ_ONLY   0x40 // only perform extension
 #define KSW_EZ_REV_CIGAR   0x80 // reverse CIGAR in the output
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct {
 	uint32_t max:31, zdropped:1;
 	int max_q, max_t;      // max extension coordinate
@@ -23,10 +27,6 @@ typedef struct {
 	uint32_t *cigar;
 } ksw_extz_t;
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /**
  * NW-like extension
  *
diff --git a/main.c b/main.c
index 68b96910..c554bd9f 100644
--- a/main.c
+++ b/main.c
@@ -10,7 +10,7 @@
 #include "minimap.h"
 #include "mmpriv.h"
 
-#define MM_VERSION "2.0-r187-dirty"
+#define MM_VERSION "2.0-r188-dirty"
 
 void liftrlimit()
 {
@@ -66,7 +66,7 @@ int main(int argc, char *argv[])
 	int i, c, k = 17, w = -1, bucket_bits = MM_IDX_DEF_B, n_threads = 3, keep_name = 1, is_idx, is_hpc = 0, long_idx;
 	int minibatch_size = 200000000;
 	uint64_t batch_size = 4000000000ULL;
-	bseq_file_t *fp = 0;
+	mm_bseq_file_t *fp = 0;
 	char *fnw = 0, *s;
 	FILE *fpr = 0, *fpw = 0;
 
@@ -203,12 +203,12 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 	if (is_idx) fpr = fopen(argv[optind], "rb");
-	else fp = bseq_open(argv[optind]);
+	else fp = mm_bseq_open(argv[optind]);
 	if (fnw) fpw = fopen(fnw, "wb");
 	for (;;) {
 		mm_idx_t *mi = 0;
 		if (fpr) mi = mm_idx_load(fpr);
-		else if (!bseq_eof(fp))
+		else if (!mm_bseq_eof(fp))
 			mi = mm_idx_gen(fp, w, k, bucket_bits, is_hpc, minibatch_size, n_threads, batch_size, keep_name);
 		if (mi == 0) break;
 		if (mm_verbose >= 3)
@@ -227,7 +227,7 @@ int main(int argc, char *argv[])
 	}
 	if (fpw) fclose(fpw);
 	if (fpr) fclose(fpr);
-	if (fp)  bseq_close(fp);
+	if (fp)  mm_bseq_close(fp);
 
 	fprintf(stderr, "[M::%s] Version: %s\n", __func__, MM_VERSION);
 	fprintf(stderr, "[M::%s] CMD:", __func__);
diff --git a/map.c b/map.c
index 0d200574..81f7db83 100644
--- a/map.c
+++ b/map.c
@@ -281,7 +281,7 @@ mm_reg1_t *mm_map(const mm_idx_t *mi, int l_seq, const char *seq, int *n_regs, m
 typedef struct {
 	int mini_batch_size, n_processed, n_threads;
 	const mm_mapopt_t *opt;
-	bseq_file_t *fp;
+	mm_bseq_file_t *fp;
 	const mm_idx_t *mi;
 	kstring_t str;
 } pipeline_t;
@@ -289,7 +289,7 @@ typedef struct {
 typedef struct {
 	const pipeline_t *p;
     int n_seq;
-	bseq1_t *seq;
+	mm_bseq1_t *seq;
 	int *n_reg;
 	mm_reg1_t **reg;
 	mm_tbuf_t **buf;
@@ -311,7 +311,7 @@ static void *worker_pipeline(void *shared, int step, void *in)
 		int with_qual = (!!(p->opt->flag & MM_F_OUT_SAM) && !(p->opt->flag & MM_F_NO_QUAL));
         step_t *s;
         s = (step_t*)calloc(1, sizeof(step_t));
-		s->seq = bseq_read(p->fp, p->mini_batch_size, with_qual, &s->n_seq);
+		s->seq = mm_bseq_read(p->fp, p->mini_batch_size, with_qual, &s->n_seq);
 		if (s->seq) {
 			s->p = p;
 			for (i = 0; i < s->n_seq; ++i)
@@ -332,7 +332,7 @@ static void *worker_pipeline(void *shared, int step, void *in)
 		for (i = 0; i < p->n_threads; ++i) mm_tbuf_destroy(s->buf[i]);
 		free(s->buf);
 		for (i = 0; i < s->n_seq; ++i) {
-			bseq1_t *t = &s->seq[i];
+			mm_bseq1_t *t = &s->seq[i];
 			for (j = 0; j < s->n_reg[i]; ++j) {
 				mm_reg1_t *r = &s->reg[i][j];
 				if (p->opt->flag & MM_F_OUT_SAM) mm_write_sam(&p->str, mi, t, r);
@@ -360,7 +360,7 @@ int mm_map_file(const mm_idx_t *idx, const char *fn, const mm_mapopt_t *opt, int
 {
 	pipeline_t pl;
 	memset(&pl, 0, sizeof(pipeline_t));
-	pl.fp = bseq_open(fn);
+	pl.fp = mm_bseq_open(fn);
 	if (pl.fp == 0) return -1;
 	pl.opt = opt, pl.mi = idx;
 	pl.n_threads = n_threads, pl.mini_batch_size = mini_batch_size;
@@ -371,6 +371,6 @@ int mm_map_file(const mm_idx_t *idx, const char *fn, const mm_mapopt_t *opt, int
 	}
 	kt_pipeline(n_threads == 1? 1 : 2, worker_pipeline, &pl, 3);
 	free(pl.str.s);
-	bseq_close(pl.fp);
+	mm_bseq_close(pl.fp);
 	return 0;
 }
diff --git a/minimap.h b/minimap.h
index 6c68c626..14fc4470 100644
--- a/minimap.h
+++ b/minimap.h
@@ -15,6 +15,10 @@
 
 #define MM_IDX_MAGIC   "MMI\2"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct {
  	uint64_t x, y;
 } mm128_t;
@@ -100,22 +104,18 @@ extern double mm_realtime0;
 struct mm_tbuf_s;
 typedef struct mm_tbuf_s mm_tbuf_t;
 
-struct bseq_file_s;
+struct mm_bseq_file_s;
 
 #define mm_seq4_set(s, i, c) ((s)[(i)>>3] |= (uint32_t)(c) << (((i)&7)<<2))
 #define mm_seq4_get(s, i)    ((s)[(i)>>3] >> (((i)&7)<<2) & 0xf)
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 // compute minimizers
 void mm_sketch(void *km, const char *str, int len, int w, int k, uint32_t rid, int is_hpc, mm128_v *p);
 
 // minimizer indexing
 mm_idx_t *mm_idx_init(int w, int k, int b, int is_hpc);
 void mm_idx_destroy(mm_idx_t *mi);
-mm_idx_t *mm_idx_gen(struct bseq_file_s *fp, int w, int k, int b, int is_hpc, int mini_batch_size, int n_threads, uint64_t batch_size, int keep_name);
+mm_idx_t *mm_idx_gen(struct mm_bseq_file_s *fp, int w, int k, int b, int is_hpc, int mini_batch_size, int n_threads, uint64_t batch_size, int keep_name);
 uint32_t mm_idx_cal_max_occ(const mm_idx_t *mi, float f);
 void mm_idx_stat(const mm_idx_t *idx);
 const uint64_t *mm_idx_get(const mm_idx_t *mi, uint64_t minier, int *n);
diff --git a/mmpriv.h b/mmpriv.h
index 6fff0973..242c7990 100644
--- a/mmpriv.h
+++ b/mmpriv.h
@@ -16,6 +16,10 @@
 #define kroundup32(x) (--(x), (x)|=(x)>>1, (x)|=(x)>>2, (x)|=(x)>>4, (x)|=(x)>>8, (x)|=(x)>>16, ++(x))
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifndef KSTRING_T
 #define KSTRING_T kstring_t
 typedef struct __kstring_t {
@@ -24,10 +28,6 @@ typedef struct __kstring_t {
 } kstring_t;
 #endif
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 double cputime(void);
 double realtime(void);
 
@@ -35,8 +35,8 @@ void radix_sort_128x(mm128_t *beg, mm128_t *end);
 void radix_sort_64(uint64_t *beg, uint64_t *end);
 uint32_t ks_ksmall_uint32_t(size_t n, uint32_t arr[], size_t kk);
 
-void mm_write_paf(kstring_t *s, const mm_idx_t *mi, const bseq1_t *t, const mm_reg1_t *r);
-void mm_write_sam(kstring_t *s, const mm_idx_t *mi, const bseq1_t *t, const mm_reg1_t *r);
+void mm_write_paf(kstring_t *s, const mm_idx_t *mi, const mm_bseq1_t *t, const mm_reg1_t *r);
+void mm_write_sam(kstring_t *s, const mm_idx_t *mi, const mm_bseq1_t *t, const mm_reg1_t *r);
 int mm_chain_dp(int max_dist, int bw, int max_skip, int min_cnt, int min_sc, int64_t n, mm128_t *a, uint64_t **_u, void *km);
 mm_reg1_t *mm_align_skeleton(void *km, const mm_mapopt_t *opt, const mm_idx_t *mi, int qlen, const char *qstr, int *n_regs_, mm_reg1_t *regs, mm128_t *a);
 
diff --git a/sdust.h b/sdust.h
index 47a71651..a12cab28 100644
--- a/sdust.h
+++ b/sdust.h
@@ -3,13 +3,13 @@
 
 #include <stdint.h>
 
-struct sdust_buf_s;
-typedef struct sdust_buf_s sdust_buf_t;
-
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+struct sdust_buf_s;
+typedef struct sdust_buf_s sdust_buf_t;
+
 // the simple interface
 uint64_t *sdust(void *km, const uint8_t *seq, int l_seq, int T, int W, int *n);