diff --git a/ld/config/decstation.mh b/ld/config/decstation.mh
index 4a17e631b96..8b2da6f8d98 100755
--- a/ld/config/decstation.mh
+++ b/ld/config/decstation.mh
@@ -1,2 +1 @@
-HDEFINES=-DHOST_SYS=DEC3100_SYS
 YACC=yacc -vd
diff --git a/ld/config/dgux.mh b/ld/config/dgux.mh
index 9c4e9bc77ee..3e987a432d6 100644
--- a/ld/config/dgux.mh
+++ b/ld/config/dgux.mh
@@ -1,4 +1,4 @@
-HDEFINES = -DHOST_SYS=DGUX_SYS -D__using_DGUX
+HDEFINES = -D__using_DGUX
 
 CC = gcc -Wall -ansi
 YACC=yacc -tvd
diff --git a/ld/config/news.mh b/ld/config/news.mh
index 93d54aa5c51..41c4647a964 100755
--- a/ld/config/news.mh
+++ b/ld/config/news.mh
@@ -1,4 +1,3 @@
-CDEFINES=-DHOST_SYS=NEWSOS3_SYS
 #CC=gcc -ansi -Wall
 CC=cc
 YACC=yacc -d
diff --git a/ld/config/rtbsd.mh b/ld/config/rtbsd.mh
index 7d2ff5a4754..0493affa789 100644
--- a/ld/config/rtbsd.mh
+++ b/ld/config/rtbsd.mh
@@ -2,6 +2,6 @@
 # environment.  If you don't have gcc, I was able to get 'hc -Hnocpp -ma'
 # to compile most of the modules, but didn't try running anything.
 YACC = yacc -d
-HDEFINES = -DHOST_SYS=RTBSD_SYS  -DNO_VARARGS
+HDEFINES = -DNO_VARARGS
 LDFLAGS = 
 CC=gcc		# hc/pcc just can't cut it
diff --git a/ld/config/sparc-ll.mh b/ld/config/sparc-ll.mh
index 92f74ad36b1..23cdb4727cd 100644
--- a/ld/config/sparc-ll.mh
+++ b/ld/config/sparc-ll.mh
@@ -1,4 +1,4 @@
-HDEFINES=-DHOST_SYS=SUN4_SYS  -DHOST_64_BIT="long long"
+HDEFINES=-DHOST_64_BIT="long long"
 YACC=yacc -tvd
 CC=/usr/latest/bin/gcc -Wall -ansi
 #stuff for self hosting
diff --git a/ld/config/sparc.mh b/ld/config/sparc.mh
index ebd85110209..257831796ca 100755
--- a/ld/config/sparc.mh
+++ b/ld/config/sparc.mh
@@ -1,4 +1,3 @@
-HDEFINES=-DHOST_SYS=SUN4_SYS  
 YACC=yacc -tvd
 #CC=gcc -Wall -ansi
 #stuff for self hosting
diff --git a/ld/config/sun3.mh b/ld/config/sun3.mh
index 5922ac16306..616605090b3 100644
--- a/ld/config/sun3.mh
+++ b/ld/config/sun3.mh
@@ -1,4 +1,3 @@
-CDEFINES=-DHOST_SYS=SUN3_SYS
 #CC=gcc -ansi -Wall
 CC=cc
 YACC=yacc -d