diff --git a/historic/jam/src/Jambase b/historic/jam/src/Jambase
index e2c6111d8..3d246bf3e 100644
--- a/historic/jam/src/Jambase
+++ b/historic/jam/src/Jambase
@@ -815,7 +815,6 @@ else if $(UNIX)
     CC          ?= gcc ;
     CCFLAGS     += -D__cygwin__ ;
     LEX         ?= flex ;
-    JAMSHELL    ?= sh -c ;
     RANLIB      ?= "" ;
     SUFEXE      ?= .exe ;
     YACC        ?= "bison -y" ;
@@ -832,7 +831,6 @@ else if $(UNIX)
 
     case INTERIX :
     CC          ?= gcc ;
-    JAMSHELL    ?= sh -c ;
     RANLIB      ?= "" ;
 
     case IRIX :
diff --git a/historic/jam/src/jambase.c b/historic/jam/src/jambase.c
index 5c33f0a2c..0d4e2d4b9 100644
--- a/historic/jam/src/jambase.c
+++ b/historic/jam/src/jambase.c
@@ -526,7 +526,6 @@ char *jambase[] = {
 "CC          ?= gcc ;\n",
 "CCFLAGS     += -D__cygwin__ ;\n",
 "LEX         ?= flex ;\n",
-"JAMSHELL    ?= sh -c ;\n",
 "RANLIB      ?= \"\" ;\n",
 "SUFEXE      ?= .exe ;\n",
 "YACC        ?= \"bison -y\" ;\n",
@@ -540,7 +539,6 @@ char *jambase[] = {
 "RANLIB      ?= \"\" ;\n",
 "case INTERIX :\n",
 "CC          ?= gcc ;\n",
-"JAMSHELL    ?= sh -c ;\n",
 "RANLIB      ?= \"\" ;\n",
 "case IRIX :\n",
 "RANLIB      ?= \"\" ;\n",
diff --git a/jam_src/Jambase b/jam_src/Jambase
index e2c6111d8..3d246bf3e 100644
--- a/jam_src/Jambase
+++ b/jam_src/Jambase
@@ -815,7 +815,6 @@ else if $(UNIX)
     CC          ?= gcc ;
     CCFLAGS     += -D__cygwin__ ;
     LEX         ?= flex ;
-    JAMSHELL    ?= sh -c ;
     RANLIB      ?= "" ;
     SUFEXE      ?= .exe ;
     YACC        ?= "bison -y" ;
@@ -832,7 +831,6 @@ else if $(UNIX)
 
     case INTERIX :
     CC          ?= gcc ;
-    JAMSHELL    ?= sh -c ;
     RANLIB      ?= "" ;
 
     case IRIX :
diff --git a/jam_src/jambase.c b/jam_src/jambase.c
index 5c33f0a2c..0d4e2d4b9 100644
--- a/jam_src/jambase.c
+++ b/jam_src/jambase.c
@@ -526,7 +526,6 @@ char *jambase[] = {
 "CC          ?= gcc ;\n",
 "CCFLAGS     += -D__cygwin__ ;\n",
 "LEX         ?= flex ;\n",
-"JAMSHELL    ?= sh -c ;\n",
 "RANLIB      ?= \"\" ;\n",
 "SUFEXE      ?= .exe ;\n",
 "YACC        ?= \"bison -y\" ;\n",
@@ -540,7 +539,6 @@ char *jambase[] = {
 "RANLIB      ?= \"\" ;\n",
 "case INTERIX :\n",
 "CC          ?= gcc ;\n",
-"JAMSHELL    ?= sh -c ;\n",
 "RANLIB      ?= \"\" ;\n",
 "case IRIX :\n",
 "RANLIB      ?= \"\" ;\n",