diff --git a/src/cmd/printf/printf.c b/src/cmd/printf/printf.c
index 5143a46..91553f2 100644
--- a/src/cmd/printf/printf.c
+++ b/src/cmd/printf/printf.c
@@ -35,6 +35,8 @@
 #include <strings.h>
 #include <errno.h>
 #include <sys/types.h>
+#include <stdlib.h>
+#include <unistd.h>
 
 #define PF(f, func) { \
 	if (fieldwidth) \
@@ -232,7 +234,7 @@ escape(fmt)
 	register int value;
 	int c;
 
-	for (store = fmt; c = *fmt; ++fmt, ++store) {
+	for (store = fmt; (c = *fmt); ++fmt, ++store) {
 		if (c != '\\') {
 			*store = c;
 			continue;
diff --git a/src/cmd/re/r.cmd.c b/src/cmd/re/r.cmd.c
index c0fac3c..c1c1afb 100644
--- a/src/cmd/re/r.cmd.c
+++ b/src/cmd/re/r.cmd.c
@@ -7,6 +7,8 @@
 #include "r.defs.h"
 #include <sys/wait.h>
 
+static char *searchkey;
+
 static int insert_mode = 1;     /* Insert mode */
 static int clr_arg_area;        /* Need to erase the arg area */
 static int fname_cvt_flag;      /* Disable filename conversion on "re -" */
diff --git a/src/cmd/re/r.defs.h b/src/cmd/re/r.defs.h
index 1f23d97..08c0fc0 100644
--- a/src/cmd/re/r.defs.h
+++ b/src/cmd/re/r.defs.h
@@ -104,8 +104,8 @@ typedef struct {
     int nlines;             /* Number of non-empty lines in file */
 } file_t;
 
-file_t file[MAXFILES];     /* Table of files */
-int curfile;
+extern file_t file[MAXFILES]; /* Table of files */
+extern int curfile;
 
 /*
  * Workspace describes a generic file under edit.
@@ -121,7 +121,7 @@ typedef struct {
     int cursorrow;          /* Saved cursorline, when not active */
 } workspace_t;
 
-workspace_t *curwksp, *pickwksp;
+extern workspace_t *curwksp, *pickwksp;
 
 /*
  * Window - a region on the display.
@@ -146,12 +146,12 @@ typedef struct {
     char *rightbar;         /* Symbols on right edge */
 } window_t;
 
-window_t *winlist[MAXWINLIST];
-int nwinlist;
+extern window_t *winlist[MAXWINLIST];
+extern int nwinlist;
 
-window_t *curwin;           /* Current window */
-window_t wholescreen;       /* The whole screen */
-window_t paramwin;          /* Window to enter arguments */
+extern window_t *curwin;    /* Current window */
+extern window_t wholescreen; /* The whole screen */
+extern window_t paramwin;   /* Window to enter arguments */
 
 /*
  * Copy-and-paste clipboard.
@@ -162,7 +162,7 @@ typedef struct {
     int ncolumns;           /* Number of columns */
 } clipboard_t;
 
-clipboard_t *pickbuf, *deletebuf;
+extern clipboard_t *pickbuf, *deletebuf;
 
 /*
  * Control codes.
@@ -200,19 +200,19 @@ clipboard_t *pickbuf, *deletebuf;
 #define CCQUIT      0177    /* terminate session    ^X ^C           */
 #define CCINTRUP    0237    /* interrupt (journal) */
 
-int cursorline;             /* physical position of */
-int cursorcol;              /* cursor from (0,0)=ulhc of text in window */
+extern int cursorline;      /* physical position of */
+extern int cursorcol;       /* cursor from (0,0)=ulhc of text in window */
 
-int NCOLS, NLINES;          /* size of the screen */
+extern int NCOLS, NLINES;   /* size of the screen */
 
 extern char *curspos, *cvtout[];
 extern char cntlmotions[];
 extern const char in0tab[]; /* input control codes */
 
-extern int keysym;          /* Current input symbol, -1 - need more */
-char intrflag;              /* INTR signal occured */
-int highlight_position;     /* Highlight the current cursor position */
-int message_displayed;      /* Arg area contains an error message */
+extern int keysym;              /* Current input symbol, -1 - need more */
+extern char intrflag;           /* INTR signal occured */
+extern int highlight_position;  /* Highlight the current cursor position */
+extern int message_displayed;   /* Arg area contains an error message */
 
 /* Defaults. */
 extern int defloffset, defroffset;
@@ -226,33 +226,31 @@ extern char deffile[];
  * param_c0, param_r0, param_c1,
  * param_r1   - coordinates of cursor-defined area
  */
-int param_len;
-char *param_str, param_type;
-int param_c0, param_r0, param_c1, param_r1;
+extern int param_len;
+extern char *param_str, param_type;
+extern int param_c0, param_r0, param_c1, param_r1;
 
 /*
  * Current line.
  */
-char *cline;                /* allocated array */
-int cline_max;              /* allocated length */
-int cline_len;              /* used length */
-int cline_incr;             /* increment for reallocation */
-char cline_modified;        /* line was modified */
-int clineno;                /* line number in file */
+extern char *cline;         /* allocated array */
+extern int cline_max;       /* allocated length */
+extern int cline_len;       /* used length */
+extern int cline_incr;      /* increment for reallocation */
+extern char cline_modified; /* line was modified */
+extern int clineno;         /* line number in file */
 
 /*
  * File descriptors:
  */
-int tempfile;               /* Temporary file */
-off_t tempseek;             /* Offset in temporary file */
-int journal;                /* Journaling file */
-int inputfile;              /* Input file (stdin or journal) */
+extern int tempfile;        /* Temporary file */
+extern off_t tempseek;      /* Offset in temporary file */
+extern int journal;         /* Journaling file */
+extern int inputfile;       /* Input file (stdin or journal) */
 
-char *searchkey;
+extern int userid, groupid;
 
-int userid, groupid;
-
-char *tmpname;              /* name of file, for do command */
+extern char *tmpname;       /* name of file, for do command */
 
 /*
  * Translation of control codes to escape sequences.
diff --git a/src/cmd/re/r.display.c b/src/cmd/re/r.display.c
index 476b503..7b5a250 100644
--- a/src/cmd/re/r.display.c
+++ b/src/cmd/re/r.display.c
@@ -6,6 +6,21 @@
  */
 #include "r.defs.h"
 
+/*
+ * Global variables for param().
+ * param_len    - length of the parameter;
+ * param_str    - string value of the parameter,
+ * param_type - type of the parameter,
+ * param_c0, param_r0, param_c1,
+ * param_r1   - coordinates of cursor-defined area
+ */
+int param_len;
+char *param_str, param_type;
+int param_c0, param_r0, param_c1, param_r1;
+
+int highlight_position;     /* Highlight the current cursor position */
+int message_displayed;      /* Arg area contains an error message */
+
 /*
  * Draw lines from lo to lf.
  * In case lo is negative:
diff --git a/src/cmd/re/r.edit.c b/src/cmd/re/r.edit.c
index 3c5bf8a..f16dcd4 100644
--- a/src/cmd/re/r.edit.c
+++ b/src/cmd/re/r.edit.c
@@ -22,6 +22,9 @@ static int buf_count;           /* Number of valid bytes in read_buf */
 static int buf_next;            /* Next unread index in read_buf */
 static int cline_read_offset;   /* Offset of next unread symbol */
 
+file_t file[MAXFILES];          /* Table of files */
+int curfile;
+
 /*
  * Setup for a cline_read routine to read a given file starting
  * from a given offset.
diff --git a/src/cmd/re/r.gettc.c b/src/cmd/re/r.gettc.c
index 44ba239..cb511fc 100644
--- a/src/cmd/re/r.gettc.c
+++ b/src/cmd/re/r.gettc.c
@@ -6,6 +6,22 @@
  */
 #include "r.defs.h"
 
+int NCOLS, NLINES;      /* size of the screen */
+char intrflag;          /* INTR signal occured */
+int tempfile;           /* Temporary file */
+off_t tempseek;         /* Offset in temporary file */
+char *tmpname;          /* name of file, for do command */
+
+workspace_t *curwksp, *pickwksp;
+clipboard_t *pickbuf, *deletebuf;
+
+window_t *curwin;       /* Current window */
+window_t wholescreen;   /* The whole screen */
+window_t paramwin;      /* Window to enter arguments */
+
+window_t *winlist[MAXWINLIST];
+int nwinlist;
+
 /*
  * Output codes
  */
diff --git a/src/cmd/re/r.main.c b/src/cmd/re/r.main.c
index a2b2b6f..296b2dc 100644
--- a/src/cmd/re/r.main.c
+++ b/src/cmd/re/r.main.c
@@ -29,15 +29,22 @@ char deffile[] = "/share/re.help";  /* Help file    */
 
 /* Initial values. */
 int cline_max  = 0;
-int cline_incr = 20; /* Increment for line expand */
+int cline_incr = 20;                /* Increment for line expand */
 int clineno = -1;
 char cline_modified = 0;
+char *cline;                        /* allocated array */
+int cline_len;                      /* used length */
 
 int journal  = -1;                  /* File descriptor for a journal */
 int inputfile = 0;                  /* Journal or stdin */
 
 int oldttmode;                      /* Saved access mode of /dev/tty */
 
+int userid, groupid;
+
+int cursorline;                     /* physical position of */
+int cursorcol;                      /* cursor from (0,0)=ulhc of text in window */
+
 static char *ttynm, *jname, *rfile;
 static clipboard_t pb, db;
 
diff --git a/src/cmd/renice/renice.c b/src/cmd/renice/renice.c
index 10cb52a..eb80d20 100644
--- a/src/cmd/renice/renice.c
+++ b/src/cmd/renice/renice.c
@@ -9,12 +9,35 @@
 #include <stdlib.h>
 #include <pwd.h>
 #include <errno.h>
+#include <string.h>
+
+int
+donice(which, who, prio)
+	int which, who, prio;
+{
+	int oldprio;
+
+	errno = 0, oldprio = getpriority(which, who);
+	if (oldprio == -1 && errno) {
+		fprintf(stderr, "renice: %d: ", who);
+		perror("getpriority");
+		return (1);
+	}
+	if (setpriority(which, who, prio) < 0) {
+		fprintf(stderr, "renice: %d: ", who);
+		perror("setpriority");
+		return (1);
+	}
+	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
+	return (0);
+}
 
 /*
  * Change the priority (nice) of processes
  * or groups of processes which are already
  * running.
  */
+int
 main(argc, argv)
 	char **argv;
 {
@@ -67,23 +90,3 @@ main(argc, argv)
 	}
 	exit(errs != 0);
 }
-
-donice(which, who, prio)
-	int which, who, prio;
-{
-	int oldprio;
-
-	errno = 0, oldprio = getpriority(which, who);
-	if (oldprio == -1 && errno) {
-		fprintf(stderr, "renice: %d: ", who);
-		perror("getpriority");
-		return (1);
-	}
-	if (setpriority(which, who, prio) < 0) {
-		fprintf(stderr, "renice: %d: ", who);
-		perror("setpriority");
-		return (1);
-	}
-	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
-	return (0);
-}
diff --git a/src/cmd/retroforth/Makefile b/src/cmd/retroforth/Makefile
index 31b2768..04aed64 100644
--- a/src/cmd/retroforth/Makefile
+++ b/src/cmd/retroforth/Makefile
@@ -11,7 +11,8 @@ LIBS            += -ltermcap
 all:            $(BIN)
 
 $(BIN):         ${SRCS}
-		${LD} ${LDFLAGS} -o $(BIN).elf $(SRCS) ${LIBS}
+		${CC} ${CFLAGS} -c -o $(OBJS) $(SRCS)
+		${LD} ${LDFLAGS} -o $(BIN).elf $(OBJS) ${LIBS}
 		${SIZE} $(BIN).elf
 		${OBJDUMP} -S $(BIN).elf > $(BIN).dis
 		${ELF2AOUT} $(BIN).elf $@ && rm $(BIN).elf
diff --git a/src/cmd/scm/Makefile b/src/cmd/scm/Makefile
index a7e0b06..c4e5e40 100644
--- a/src/cmd/scm/Makefile
+++ b/src/cmd/scm/Makefile
@@ -2,7 +2,7 @@ TOPSRC		= $(shell cd ../../..; pwd)
 include $(TOPSRC)/target.mk
 #include $(TOPSRC)/cross.mk
 
-CFLAGS		+= -Os -Wall -Werror
+CFLAGS		+= -Os -Wall -Werror -DNDEBUG
 
 OBJS            = scm.o func.o
 TESTS           = tests/*.scm
diff --git a/src/elf32-mips.ld b/src/elf32-mips.ld
index dae0110..5781b4a 100644
--- a/src/elf32-mips.ld
+++ b/src/elf32-mips.ld
@@ -21,7 +21,6 @@ SECTIONS
   /* Read-only sections, merged into text segment: */
   PROVIDE (__executable_start = 0x7f008000); . = 0x7f008000;
   .interp         : { *(.interp) }
-  /*.reginfo        : { *(.reginfo) }*/
   .note.gnu.build-id : { *(.note.gnu.build-id) }
   .dynamic        : { *(.dynamic) }
   .hash           : { *(.hash) }
@@ -77,6 +76,7 @@ SECTIONS
     /* .gnu.warning sections are handled specially by elf32.em.  */
     *(.gnu.warning)
     *(.mips16.fn.*) *(.mips16.call.*)
+    . = ALIGN(32*2 / 8);
   } =0
   .fini           :
   {
@@ -163,10 +163,8 @@ SECTIONS
     SORT(CONSTRUCTORS)
   }
   .data1          : { *(.data1) }
-  .got.plt        : { *(.got.plt) }
   . = .;
   _gp = ALIGN(16) + 0x7ff0;
-  .got            : { *(.got) }
   /* We want the small data sections together, so single-instruction offsets
      can access them all, and initialized data all before uninitialized, so
      we can shorten the on-disk segment size.  */