diff --git a/sch2fig/Makefile b/sch2fig/Makefile
index 0101b08..f70a278 100644
--- a/sch2fig/Makefile
+++ b/sch2fig/Makefile
@@ -14,6 +14,7 @@ NAME = sch2fig
 OBJS = main.o sch.o lib.o style.o fig.o cairo.o gfx.o dwg.o text.o misc.o
 
 CFLAGS = -g -O -Wall -Wextra -Wno-unused-parameter -Wshadow \
+	 -Wmissing-prototypes -Wmissing-declarations \
 	 `pkg-config --cflags cairo`
 LIBS = -lm `pkg-config --libs cairo`
 
diff --git a/sch2fig/cairo.c b/sch2fig/cairo.c
index d3d9227..898f5b8 100644
--- a/sch2fig/cairo.c
+++ b/sch2fig/cairo.c
@@ -102,7 +102,7 @@ static void paint(cairo_t *cr, int color, int fill_color)
 /* ----- General items ----------------------------------------------------- */
 
 
-void cr_poly(void *ctx, int points, int x[points], int y[points],
+static void cr_poly(void *ctx, int points, int x[points], int y[points],
     int color, int fill_color, unsigned layer)
 {
 	struct cairo_ctx *cc = ctx;
@@ -125,7 +125,7 @@ void cr_poly(void *ctx, int points, int x[points], int y[points],
 }
 
 
-void cr_circ(void *ctx, int x, int y, int r,
+static void cr_circ(void *ctx, int x, int y, int r,
     int color, int fill_color, unsigned layer)
 {
 	struct cairo_ctx *cc = ctx;
@@ -136,7 +136,7 @@ void cr_circ(void *ctx, int x, int y, int r,
 }
 
 
-void cr_arc(void *ctx, int x, int y, int r, int sa, int ea,
+static void cr_arc(void *ctx, int x, int y, int r, int sa, int ea,
     int color, int fill_color, unsigned layer)
 {
 	struct cairo_ctx *cc = ctx;
@@ -151,7 +151,7 @@ void cr_arc(void *ctx, int x, int y, int r, int sa, int ea,
 #define	TEXT_STRETCH	1.3
 
 
-void cr_text(void *ctx, int x, int y, const char *s, unsigned size,
+static void cr_text(void *ctx, int x, int y, const char *s, unsigned size,
     enum text_align align, int rot, unsigned color, unsigned layer)
 {
 	struct cairo_ctx *cc = ctx;
@@ -186,7 +186,7 @@ void cr_text(void *ctx, int x, int y, const char *s, unsigned size,
 }
 
 
-unsigned cr_text_width(void *ctx, const char *s, unsigned size)
+static unsigned cr_text_width(void *ctx, const char *s, unsigned size)
 {
 	struct cairo_ctx *cc = ctx;
 	cairo_text_extents_t ext;
@@ -200,7 +200,7 @@ unsigned cr_text_width(void *ctx, const char *s, unsigned size)
 /* ----- Initializatio and termination ------------------------------------- */
 
 
-void *cr_init(const char *template, int n_vars, const char **vars)
+static void *cr_init(const char *template, int n_vars, const char **vars)
 {
 	struct cairo_ctx *cc;
 
@@ -219,7 +219,7 @@ void *cr_init(const char *template, int n_vars, const char **vars)
 }
 
 
-void cr_end(void *ctx)
+static void cr_end(void *ctx)
 {
 	struct cairo_ctx *cc = ctx;
 
diff --git a/sch2fig/fig.c b/sch2fig/fig.c
index 30ef309..9a73891 100644
--- a/sch2fig/fig.c
+++ b/sch2fig/fig.c
@@ -52,7 +52,7 @@ static inline float pt(int x)
 /* ----- Schematics items -------------------------------------------------- */
 
 
-void fig_line(void *ctx, int sx, int sy, int ex, int ey,
+static void fig_line(void *ctx, int sx, int sy, int ex, int ey,
     int color, unsigned layer)
 {
 	//	TypeStyle   FillCol AreaFil  Cap  FwdAr
@@ -67,7 +67,7 @@ void fig_line(void *ctx, int sx, int sy, int ex, int ey,
 /* ----- General items ----------------------------------------------------- */
 
 
-void fig_rect(void *ctx, int sx, int sy, int ex, int ey,
+static void fig_rect(void *ctx, int sx, int sy, int ex, int ey,
     int color, int fill_color, unsigned layer)
 {
 	//	Type  Thick    Depth    StyleV  Rad
@@ -82,7 +82,7 @@ void fig_rect(void *ctx, int sx, int sy, int ex, int ey,
 }
 
 
-void fig_poly(void *ctx, int points, int x[points], int y[points],
+static void fig_poly(void *ctx, int points, int x[points], int y[points],
     int color, int fill_color, unsigned layer)
 {
 	int i;
@@ -102,7 +102,7 @@ void fig_poly(void *ctx, int points, int x[points], int y[points],
 }
 
 
-void fig_circ(void *ctx, int x, int y, int r,
+static void fig_circ(void *ctx, int x, int y, int r,
     int color, int fill_color, unsigned layer)
 {
 	//	Type  Thick    Depth   StyleV    Cx    Rx    Sx    Ex
@@ -132,7 +132,7 @@ static int ay(int x, int y, int r, int angle)
 }
 
 
-void fig_arc(void *ctx, int x, int y, int r, int sa, int ea,
+static void fig_arc(void *ctx, int x, int y, int r, int sa, int ea,
     int color, int fill_color, unsigned layer)
 {
 	int ma = (sa + ea) / 2;
@@ -150,7 +150,7 @@ void fig_arc(void *ctx, int x, int y, int r, int sa, int ea,
 }
 
 
-void fig_text(void *ctx, int x, int y, const char *s, unsigned size,
+static void fig_text(void *ctx, int x, int y, const char *s, unsigned size,
     enum text_align align, int rot, unsigned color, unsigned layer)
 {
 	//	Type   Depth     FontSiz Height
@@ -162,7 +162,7 @@ void fig_text(void *ctx, int x, int y, const char *s, unsigned size,
 }
 
 
-unsigned fig_text_width(void *ctx, const char *s, unsigned size)
+static unsigned fig_text_width(void *ctx, const char *s, unsigned size)
 {
 	/*
 	 * Note that we stretch the text size, so the ratio is larger than
@@ -214,7 +214,7 @@ static bool apply_vars(char *buf, int n_vars, const char **vars)
 }
 
 
-void *fig_init(const char *template, int n_vars, const char **vars)
+static void *fig_init(const char *template, int n_vars, const char **vars)
 {
 	FILE *file;
 	char buf[1000];