diff --git a/README.md b/README.md
index fde5579..3f0ce53 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ Berkeley YACC, GNU bison, flex, groff, ELF library and FUSE library.
 Under Ubuntu, for example, you can do it by command:
 
 ```shell
-$ sudo apt-get install bison byacc flex groff-base libelf-dev libfuse-dev
+$ sudo apt-get install bison byacc flex groff-base libelf-dev
 ```
 
 You can change a desired filesystem size and swap area size, as required.
diff --git a/tools/fsutil/Makefile b/tools/fsutil/Makefile
index 95426ec..75bd802 100644
--- a/tools/fsutil/Makefile
+++ b/tools/fsutil/Makefile
@@ -5,14 +5,21 @@ OBJS		= fsutil.o superblock.o block.c inode.o create.o check.o \
                   file.o mount.o manifest.o
 PROG		= fsutil
 
+# Enable mount option.
+#ENABLE_FUSE    = 1
+
 # For Mac OS X
 ifneq ($(wildcard /usr/local/lib/pkgconfig),)
     FUSE_PATH   = /usr/local/lib/pkgconfig
 endif
 
 # Fuse
-MOUNT_CFLAGS    = $(shell PKG_CONFIG_PATH=$(FUSE_PATH) pkg-config fuse --cflags)
-LIBS            += $(shell PKG_CONFIG_PATH=$(FUSE_PATH) pkg-config fuse --libs)
+ifneq ($(ENABLE_FUSE),)
+    CFLAGS       += -DENABLE_FUSE
+    MOUNT_CFLAGS = -DFUSE_USE_VERSION=26
+    MOUNT_CFLAGS += $(shell PKG_CONFIG_PATH=$(FUSE_PATH) pkg-config fuse --cflags)
+    LIBS         += $(shell PKG_CONFIG_PATH=$(FUSE_PATH) pkg-config fuse --libs)
+endif
 
 all:		$(PROG)
 
diff --git a/tools/fsutil/fsutil.c b/tools/fsutil/fsutil.c
index 1d13294..92a162c 100644
--- a/tools/fsutil/fsutil.c
+++ b/tools/fsutil/fsutil.c
@@ -85,7 +85,9 @@ static void print_help (char *progname)
     printf ("  %s [--verbose] [--partition=n] disk.img\n", progname);
     printf ("  %s --check [--fix] [--partition=n] disk.img\n", progname);
     printf ("  %s --new [--size=kbytes | --partition=n] [--manifest=file] disk.img [dir]\n", progname);
+#ifdef ENABLE_FUSE
     printf ("  %s --mount [--partition=n] disk.img dir\n", progname);
+#endif
     printf ("  %s --add [--partition=n] disk.img files...\n", progname);
     printf ("  %s --extract [--partition=n] disk.img\n", progname);
     printf ("  %s --repartition=format disk.img\n", progname);
@@ -99,7 +101,9 @@ static void print_help (char *progname)
     printf ("  -s NUM, --size=NUM  Size of filesystem in kbytes.\n");
     printf ("  -M file, --manifest=file\n");
     printf ("                      List of files and attributes to create.\n");
+#ifdef ENABLE_FUSE
     printf ("  -m, --mount         Mount the filesystem.\n");
+#endif
     printf ("  -a, --add           Add files to filesystem.\n");
     printf ("  -x, --extract       Extract all files.\n");
     printf ("  -r format, --repartition=format\n");
@@ -889,7 +893,12 @@ int main (int argc, char **argv)
             print_help (argv[0]);
             return -1;
         }
+#ifdef ENABLE_FUSE
         return fs_mount(&fs, argv[i+1]);
+#else
+        fprintf (stderr, "fsutil: -m, --mount options are not supported in this version.\n");
+        return -1;
+#endif
     }
 
     /* Print the structure of flesystem. */
diff --git a/tools/fsutil/mount.c b/tools/fsutil/mount.c
index 489e84d..20f93be 100644
--- a/tools/fsutil/mount.c
+++ b/tools/fsutil/mount.c
@@ -28,7 +28,7 @@
 #include <unistd.h>
 #include <errno.h>
 
-#define FUSE_USE_VERSION 26
+#ifdef ENABLE_FUSE
 #include <fuse.h>
 
 #include "bsdfs.h"
@@ -909,3 +909,5 @@ int fs_mount(fs_t *fs, char *dirname)
     printf ("\nFilesystem %s unmounted\n", dirname);
     return ret;
 }
+
+#endif /* ENABLE_FUSE */
diff --git a/tools/virtualmips/Makefile b/tools/virtualmips/Makefile
index 76900f4..420cc4e 100644
--- a/tools/virtualmips/Makefile
+++ b/tools/virtualmips/Makefile
@@ -16,8 +16,11 @@ CFLAGS		= -DSIM_PIC32 -DPIC32MX7 -DMAX32
 #CFLAGS		= -DSIM_PIC32 -DPIC32MX7 -DUBW32
 
 CC          = gcc -g
-CFLAGS		+= -Wall -Werror -MT $@ -MD -MP -MF .deps/$*.dep -I/opt/local/include -I/opt/local/include/libelf
-LIBS		= -lpthread -lelf
+CFLAGS		+= -Wall -Werror -MT $@ -MD -MP -MF .deps/$*.dep
+LIBS		= -lpthread
+
+CFLAGS      += $(shell pkg-config libelf --cflags)
+LIBS		+= $(shell pkg-config libelf --libs)
 
 ifneq ($(wildcard /usr/lib/librt.a),)
 LIBS		+= -lrt                             # Linux
diff --git a/tools/virtualmips/dev_vtty.c b/tools/virtualmips/dev_vtty.c
index 0d62486..9c8d165 100644
--- a/tools/virtualmips/dev_vtty.c
+++ b/tools/virtualmips/dev_vtty.c
@@ -803,12 +803,12 @@ static void vtty_read_and_store (vtty_t * vtty)
         vtty->telnet_opt = c;
         /* if telnet client can support ttype, ask it to send ttype string */
         if ((vtty->telnet_cmd == WILL) && (vtty->telnet_opt == TELOPT_TTYPE)) {
-            vtty_put_char (vtty, IAC);
-            vtty_put_char (vtty, SB);
+            vtty_put_char (vtty, (char)IAC);
+            vtty_put_char (vtty, (char)SB);
             vtty_put_char (vtty, TELOPT_TTYPE);
             vtty_put_char (vtty, TELQUAL_SEND);
-            vtty_put_char (vtty, IAC);
-            vtty_put_char (vtty, SE);
+            vtty_put_char (vtty, (char)IAC);
+            vtty_put_char (vtty, (char)SE);
         }
         vtty->input_state = VTTY_INPUT_TEXT;
         return;