diff --git a/scsh/aix/stdio_dep.c b/scsh/aix/stdio_dep.c
index 13a7134..35951b8 100644
--- a/scsh/aix/stdio_dep.c
+++ b/scsh/aix/stdio_dep.c
@@ -28,6 +28,8 @@
 #include <errno.h>
 #include <sys/select.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/aix/stdio_dep.h b/scsh/aix/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/aix/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/bsd/stdio_dep.c b/scsh/bsd/stdio_dep.c
index bf4fc6c..4e22af4 100644
--- a/scsh/bsd/stdio_dep.c
+++ b/scsh/bsd/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/bsd/stdio_dep.h b/scsh/bsd/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/bsd/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/cxux/stdio_dep.c b/scsh/cxux/stdio_dep.c
index d67407b..75be4a1 100644
--- a/scsh/cxux/stdio_dep.c
+++ b/scsh/cxux/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/cxux/stdio_dep.h b/scsh/cxux/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/cxux/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/generic/stdio_dep.c b/scsh/generic/stdio_dep.c
index d67407b..75be4a1 100644
--- a/scsh/generic/stdio_dep.c
+++ b/scsh/generic/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/generic/stdio_dep.h b/scsh/generic/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/generic/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/hpux/stdio_dep.c b/scsh/hpux/stdio_dep.c
index 0bc81c1..7c95b9c 100644
--- a/scsh/hpux/stdio_dep.c
+++ b/scsh/hpux/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h"	/* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/hpux/stdio_dep.h b/scsh/hpux/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/hpux/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/irix/stdio_dep.c b/scsh/irix/stdio_dep.c
index 751bd91..4913d14 100644
--- a/scsh/irix/stdio_dep.c
+++ b/scsh/irix/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/irix/stdio_dep.h b/scsh/irix/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/irix/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/linux/stdio_dep.c b/scsh/linux/stdio_dep.c
index a670a3b..dcd800e 100644
--- a/scsh/linux/stdio_dep.c
+++ b/scsh/linux/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/linux/stdio_dep.h b/scsh/linux/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/linux/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/next/stdio_dep.c b/scsh/next/stdio_dep.c
index 54906d6..6b0d6f5 100644
--- a/scsh/next/stdio_dep.c
+++ b/scsh/next/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/next/stdio_dep.h b/scsh/next/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/next/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/solaris/stdio_dep.c b/scsh/solaris/stdio_dep.c
index 751bd91..4913d14 100644
--- a/scsh/solaris/stdio_dep.c
+++ b/scsh/solaris/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/solaris/stdio_dep.h b/scsh/solaris/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/solaris/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/sunos/stdio_dep.c b/scsh/sunos/stdio_dep.c
index 751bd91..4913d14 100644
--- a/scsh/sunos/stdio_dep.c
+++ b/scsh/sunos/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/sunos/stdio_dep.h b/scsh/sunos/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/sunos/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);
diff --git a/scsh/ultrix/stdio_dep.c b/scsh/ultrix/stdio_dep.c
index 751bd91..4913d14 100644
--- a/scsh/ultrix/stdio_dep.c
+++ b/scsh/ultrix/stdio_dep.c
@@ -26,6 +26,8 @@
 #include "libcig.h"
 #include <errno.h>
 
+#include "stdio_dep.h" /* Make sure the .h interface agrees with the code. */
+
 /* These two procs return #t if data ready, #f data not ready, 
 ** and errno if error.
 */
diff --git a/scsh/ultrix/stdio_dep.h b/scsh/ultrix/stdio_dep.h
new file mode 100644
index 0000000..6c6eaca
--- /dev/null
+++ b/scsh/ultrix/stdio_dep.h
@@ -0,0 +1,13 @@
+/* Exports from stdio_dep.h. */
+
+scheme_value char_ready_fdes(int fd);
+
+scheme_value stream_char_readyp(FILE *f);
+
+void setfileno(FILE *fs, int fd);
+
+int fbufcount(FILE* fs);
+
+int ibuf_empty(FILE *fs);
+
+int obuf_full(FILE *fs);