Issue #722: Allowing for sites to specify TCL_INCLUDE and TCL_LIBS

configure

@@ -4487,7 +4487,7 @@ done
   done
 IFS=$as_save_IFS
 
-  test -z "$ac_cv_path_pkgConfig" && ac_cv_path_pkgConfig=""""
+  test -z "$ac_cv_path_pkgConfig" && ac_cv_path_pkgConfig=""UNKNOWN_PKG_CONFIG""
   ;;
 esac
 fi
@@ -4501,7 +4501,17 @@ printf "%s\n" "no" >&6; }
 fi
 
 
-   if test -n "$TCL_PKG_CONFIG_DIR" ; then
+   if test -n "$TCL_INCLUDE" -a -n "$TCL_LIBS"; then
+      echo "using TCL_INCLUDE: $TCL_INCLUDE"
+      echo "using TCL_LIBS:    $TCL_LIBS"
+   elif test -n "$TCL_PKG_CONFIG_DIR" ; then
+      if test "$pkgConfig" = "UNKNOWN_PKG_CONFIG" ; then
+         echo
+         echo   "You must have valid pkg-config in your path. Quitting!"
+         echo
+         rm -f makefile
+         exit 1
+      fi
       export PKG_CONFIG_PATH=$TCL_PKG_CONFIG_DIR
       TCL_INCLUDE=`$pkgConfig --cflags-only-I tcl 2> /dev/null`
       TCL_LIBS=`$pkgConfig --libs tcl`
@@ -4519,16 +4529,21 @@ fi
    fi
 
    if test -z "$TCL_INCLUDE" ; then
-       if  ! test x$pkgConfig = "x"; then
-           for i in tcl tcl8.8 tcl8.7 tcl8.6 tcl8.5; do
-               $pkgConfig --exists $i
-               if test $? = 0; then
-                   TCL_INCLUDE=`PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 $pkgConfig --cflags-only-I $i 2> /dev/null`
-                   TCL_LIBS=`$pkgConfig --libs $i`
-                   break
-               fi
-           done
-       fi
+      if test "$pkgConfig" = "UNKNOWN_PKG_CONFIG" ; then
+         echo
+         echo   "You must have valid pkg-config in your path. Quitting!"
+         echo
+         rm -f makefile
+         exit 1
+      fi
+      for i in tcl tcl8.8 tcl8.7 tcl8.6 tcl8.5; do
+          $pkgConfig --exists $i
+          if test $? = 0; then
+              TCL_INCLUDE=`PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 $pkgConfig --cflags-only-I $i 2> /dev/null`
+              TCL_LIBS=`$pkgConfig --libs $i`
+              break
+          fi
+      done
    fi
 
    CPPFLAGS="$TCL_INCLUDE"
@@ -4575,7 +4590,7 @@ fi
    if test "$ac_cv_header_tcl_h" != yes ; then
       rm -f makefile
       FOUND_ERROR=yes
-      MSG="Unable to build Lmod without tcl.h.  Please install the tcl devel package or configure --with-fastTCLInterp=no to not require tcl.h.  You can also provide your own tcl source.  Please set TCL_PKG_CONFIG_DIR to point to the directory containing tcl.pc"
+      MSG="Unable to build Lmod without tcl.h.  Please install the tcl devel package or configure --with-fastTCLInterp=no to not require tcl.h.  You can also provide your own tcl source.  Please set TCL_PKG_CONFIG_DIR to point to the directory containing tcl.pc Or specify TCL_INCLUDE and TCL_LIBS"
       ERR_MSG="$ERR_MSG||$MSG"
       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: $MSG" >&5
 printf "%s\n" "$as_me: $MSG" >&6;}

configure.ac

@@ -746,7 +746,6 @@ if test "$FAST_TCL_INTERP" = yes ; then
               break
           fi
       done
-      fi  
    fi
 
    CPPFLAGS="$TCL_INCLUDE"