quick fix to make build success w/ modern compiler

fix should be done in upstream
diff --git a/Makefile b/Makefile
index 359c47a..8868558 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@ BUILD_LDFLAGS ?= $(LDFLAGS)
 
 # Some makes take the last of a list as the default ...
 all: make.fil
-	PATH="`pwd`/bin:$$PATH" $(MAKE) -f make.fil VERSION=$(VERSION) TOPDIR=`pwd` $@
+	PATH="`pwd`/bin:`pwd`/bcc:`pwd`/copt:`pwd`/cpp:$$PATH" $(MAKE) -f make.fil VERSION=$(VERSION) TOPDIR=`pwd` $@
 
 $(TARGETS): make.fil
 	PATH="`pwd`/bin:$$PATH" $(MAKE) -f make.fil VERSION=$(VERSION) TOPDIR=`pwd` $@
diff --git a/bootblocks/Makefile b/bootblocks/Makefile
index a4c3a2e..4b4aca1 100644
--- a/bootblocks/Makefile
+++ b/bootblocks/Makefile
@@ -1,5 +1,5 @@
 HOSTCC=cc
-HOSTCCFLAGS=-O2 -pipe
+HOSTCCFLAGS=-O2 -pipe -std=c89 -Wno-error=return-type
 BCC=bcc
 AS86=as86
 
diff --git a/dis88/Makefile b/dis88/Makefile
index 146d1cf..9c3ab4f 100644
--- a/dis88/Makefile
+++ b/dis88/Makefile
@@ -25,7 +25,7 @@
 # be necessary to alter the formats of the tables.
 
 #CC=bcc
-CFLAGS=-O
+CFLAGS=-O -std=c89
 LDFLAGS=
 PREFIX=/usr
 
diff --git a/dis88/dis.h b/dis88/dis.h
index 21bbc2e..bfc64e7 100644
--- a/dis88/dis.h
+++ b/dis88/dis.h
@@ -163,7 +163,7 @@ _PROTOTYPE(void mahand, (int j ));
 _PROTOTYPE(void mjhand, (int j ));
 
 /* dismain.c */
-_PROTOTYPE(void main, (int argc, char **argv ));
+_PROTOTYPE(int main, (int argc, char **argv ));
 
 /* distabs.c */
 _PROTOTYPE(char *getnam, (int k ));
diff --git a/dis88/dismain.c b/dis88/dismain.c
index 6f51e73..fb07d3e 100644
--- a/dis88/dismain.c
+++ b/dis88/dismain.c
@@ -538,7 +538,7 @@ static void disbss()
   *                                                         *
   * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
-void
+int
 main(argc,argv)
 
    int argc;                  /* Command-line args from OS  */