diff --git a/configure b/configure
index 1a884ce..9144d46 100755
--- a/configure
+++ b/configure
@@ -71,8 +71,8 @@ Build options:
   --loglevel=LOGLEVEL       library log level [$loglevel]
 
 Installation options:
-  --noinstall-manpages      should not install manpages
-  --noinstall-devel         should not install developement files
+  --no-manpages             should not make and install manpages
+  --no-devel                should not install developement files
 
 Installation directories:
   --root=ROOT               installation root [$root]
@@ -147,8 +147,8 @@ got '$level'"
 	fi
 	# then set
 	loglevel=$level ;;
---noinstall-manpages) install_manpages= ;;
---noinstall-devel) install_devel= ;;
+--no-manpages) install_manpages= ;;
+--no-devel) install_devel= ;;
 --root=*) root="${arg#*=}" ;;
 --hprefix=*) hprefix="${arg#*=}" ;;
 --prefix=*) prefix="${arg#*=}"; prefix_set=y ;;
diff --git a/src/decode/casemul.c b/src/decode/casemul.c
index 0ea9493..f6593b3 100644
--- a/src/decode/casemul.c
+++ b/src/decode/casemul.c
@@ -48,10 +48,12 @@ static int read_internal(g1m_buffer_t *buffer, uint32_t signature,
 
 	/* check type */
 	if (signature != hd.signature) {
+#if LOGLEVEL <= ll_error
 		const char *a = (char*)&signature, *b = (char*)&hd.signature;
 		log_error("signature mismatch!");
 		log_error("expected '%c%c%c%c', got '%c%c%c%c'",
 			a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);
+#endif
 		return (g1m_error_magic);
 	}
 
diff --git a/src/decode/std/addin.c b/src/decode/std/addin.c
index 64a4140..a24c960 100644
--- a/src/decode/std/addin.c
+++ b/src/decode/std/addin.c
@@ -101,6 +101,7 @@ int g1m_decode_std_cp_addin(g1m_t **h, g1m_buffer_t *buffer,
 	struct _classpad_subheader *cp, uint32_t *check)
 {
 	int err = 0;
+	(void)std; (void)cp;
 
 	/* read the add-in subheader */
 	DREAD(cphd, c1a_subheader)
@@ -165,6 +166,7 @@ int g1m_decode_std_cg_addin(g1m_t **h, g1m_buffer_t *buffer,
 	struct _prizm_subheader *prizm, uint32_t *check)
 {
 	int err = 0;
+	(void)std; (void)prizm;
 
 	/* read the add-in subheader */
 	DREAD(cghd, g3a_subheader)
diff --git a/src/decode/std/eact.c b/src/decode/std/eact.c
index f63f2c9..c8847d7 100644
--- a/src/decode/std/eact.c
+++ b/src/decode/std/eact.c
@@ -256,6 +256,8 @@ static int eact_decode_line_result(g1m_line_t *handle, uint8_t *buf, size_t size
 static int eact_decode_line_stdheading(g1m_line_t *handle, uint8_t *buf,
 	size_t size)
 {
+	(void)size;
+
 	/* log */
 	log_info("Standard heading raw data is:");
 	logm_info(buf, size);
@@ -282,6 +284,8 @@ static int eact_decode_line_stdheading(g1m_line_t *handle, uint8_t *buf,
 static int eact_decode_line_picture(g1m_line_t *handle, uint8_t *buf,
 	size_t size)
 {
+	(void)size;
+
 	/* log */
 	log_info("Picture raw data is:");
 	logm_info(buf, size);
@@ -319,6 +323,8 @@ static int eact_decode_line_picture(g1m_line_t *handle, uint8_t *buf,
 
 static int eact_decode_line_text(g1m_line_t *handle, uint8_t *buf, size_t size)
 {
+	(void)size;
+
 	/* log */
 	log_info("Text raw data is:");
 	logm_info(buf, size);
diff --git a/src/decode/std/fkey.c b/src/decode/std/fkey.c
index 1aef068..5f2df92 100644
--- a/src/decode/std/fkey.c
+++ b/src/decode/std/fkey.c
@@ -141,6 +141,7 @@ int g1m_decode_std_cg_fkey(g1m_t **h, g1m_buffer_t *buffer,
 	struct _prizm_subheader *prizm, uint32_t *check)
 {
 	int err = g1m_error_alloc; uint8_t *data = NULL;
+	(void)std; (void)prizm;
 
 	/* read the subheader */
 	DREAD(lhd, g3l_lang_header)
diff --git a/src/decode/std/lang.c b/src/decode/std/lang.c
index a8472dc..e1afff6 100644
--- a/src/decode/std/lang.c
+++ b/src/decode/std/lang.c
@@ -106,6 +106,7 @@ int g1m_decode_std_cg_lang(g1m_t **h, g1m_buffer_t *buffer,
 	struct _prizm_subheader *prizm, uint32_t *check)
 {
 	int err = g1m_error_alloc; uint8_t *data = NULL;
+	(void)std; (void)prizm;
 
 	/* read the subheader */
 	DREAD(lhd, g3l_lang_header)
diff --git a/src/utils/skip.c b/src/utils/skip.c
index 6e17f2b..d385dc2 100644
--- a/src/utils/skip.c
+++ b/src/utils/skip.c
@@ -31,7 +31,9 @@ int g1m_skip(g1m_buffer_t *buffer, size_t size, uint32_t *checksum)
 {
 	uint8_t buf[1024]; int err;
 	uint32_t add = 0;
+#if LOGLEVEL <= ll_error
 	size_t orig = size;
+#endif
 
 	while (size) {
 		/* read that much */