--- a/cgi/configure.in
+++ b/cgi/configure.in
@@ -13,15 +13,6 @@
 # Export variables
 TARGETS="all"
 
-# Building paths
-pathtmp="$PATH"
-PATH="$HOME/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
-PATH="$PATH:/usr/ccs/bin:/usr/ucb:/usr/xpg4/bin:/usr/xpg6/bin:$pathtmp"
-LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LIBRARY_PATH"
-LD_LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LD_LIBRARY_PATH"
-CPATH="$HOME/include:/usr/local/include:$CPATH"
-export PATH LIBRARY_PATH LD_LIBRARY_PATH CPATH
-
 
 
 #================================================================
--- a/configure.in
+++ b/configure.in
@@ -17,17 +17,6 @@
 MYDEFS=""
 MYOPTS=""
 MGWLIBS=""
-LD="ld"
-AR="ar"
-
-# Building paths
-pathtmp="$PATH"
-PATH="$HOME/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
-PATH="$PATH:/usr/ccs/bin:/usr/ucb:/usr/xpg4/bin:/usr/xpg6/bin:$pathtmp"
-LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LIBRARY_PATH"
-LD_LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LD_LIBRARY_PATH"
-CPATH="$HOME/include:/usr/local/include:$CPATH"
-export PATH LIBRARY_PATH LD_LIBRARY_PATH CPATH
 
 
 
@@ -186,19 +175,15 @@
 then
   MYOPTS="-O1 -fno-omit-frame-pointer -fno-force-addr"
 fi
-if gcc --version | egrep -i '^2\.(8|9)' > /dev/null 2>&1
+if $CC --version | egrep -i '^2\.(8|9)' > /dev/null 2>&1
 then
   MYOPTS="-O1 -fno-omit-frame-pointer -fno-force-addr"
 fi
 
 # Linker
-printf 'checking for ld... '
-if which ld | grep '/ld$' > /dev/null 2>&1
+AC_CHECK_TOOL(LD, ld, no)
+if test "$LD" = "no"
 then
-  LD=`which ld`
-  printf '%s\n' "$LD"
-else
-  printf 'no\n'
   if test "$isnowarn" != "yes"
   then
     printf '#================================================================\n' 1>&2
@@ -208,13 +193,9 @@
 fi
 
 # Archiver
-printf 'checking for ar... '
-if which ar | grep '/ar$' > /dev/null 2>&1
+AC_CHECK_TOOL(AR, ar, no)
+if test "$AR" = "no"
 then
-  AR=`which ar`
-  printf '%s\n' "$AR"
-else
-  printf 'no\n'
   if test "$isnowarn" != "yes"
   then
     printf '#================================================================\n' 1>&2
--- a/java/configure.in
+++ b/java/configure.in
@@ -23,16 +23,6 @@
 JAVARUN="java"
 MYDEFS=""
 MYOPTS=""
-LD="ld"
-
-# Building paths
-pathtmp="$PATH"
-PATH="$HOME/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
-PATH="$PATH:/usr/ccs/bin:/usr/ucb:/usr/xpg4/bin:/usr/xpg6/bin:$pathtmp"
-LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LIBRARY_PATH"
-LD_LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LD_LIBRARY_PATH"
-CPATH="$HOME/include:/usr/local/include:$CPATH"
-export PATH LIBRARY_PATH LD_LIBRARY_PATH CPATH
 
 
 
@@ -162,19 +152,15 @@
 then
   MYOPTS="-O1"
 fi
-if gcc --version | egrep -i '^2\.(8|9)' > /dev/null 2>&1
+if $CC --version | egrep -i '^2\.(8|9)' > /dev/null 2>&1
 then
   MYOPTS="-O1"
 fi
 
 # Linker
-printf 'checking for ld... '
-if which ld | grep '/ld$' > /dev/null 2>&1
+AC_CHECK_TOOL(LD, ld, no)
+if test "$LD" = "no"
 then
-  LD=`which ld`
-  printf '%s\n' "$LD"
-else
-  printf 'no\n'
   printf '#================================================================\n' 1>&2
   printf '# WARNING: ld is not found in PATH.\n' 1>&2
   printf '#================================================================\n' 1>&2
--- a/perl/configure.in
+++ b/perl/configure.in
@@ -5,15 +5,6 @@
 # Targets
 AC_INIT(qdbm-perl, 1.0.0)
 
-# Building paths
-pathtmp="$PATH"
-PATH="$HOME/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
-PATH="$PATH:/usr/ccs/bin:/usr/ucb:/usr/xpg4/bin:/usr/xpg6/bin:$pathtmp"
-LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LIBRARY_PATH"
-LD_LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LD_LIBRARY_PATH"
-CPATH="$HOME/include:/usr/local/include:$CPATH"
-export PATH LIBRARY_PATH LD_LIBRARY_PATH CPATH
-
 # Setting the default prefix
 if test "$prefix" = NONE
 then
--- a/plus/configure.in
+++ b/plus/configure.in
@@ -16,17 +16,6 @@
 TARGETS="all"
 MYDEFS=""
 MYOPTS=""
-LD="ld"
-AR="ar"
-
-# Building paths
-pathtmp="$PATH"
-PATH="$HOME/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
-PATH="$PATH:/usr/ccs/bin:/usr/ucb:/usr/xpg4/bin:/usr/xpg6/bin:$pathtmp"
-LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LIBRARY_PATH"
-LD_LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LD_LIBRARY_PATH"
-CPATH="$HOME/include:/usr/local/include:$CPATH"
-export PATH LIBRARY_PATH LD_LIBRARY_PATH CPATH
 
 
 
@@ -75,32 +64,24 @@
 then
   MYOPTS="-O1"
 fi
-if gcc --version | egrep -i '^2\.(8|9)' > /dev/null 2>&1
+if $CXX --version | egrep -i '^2\.(8|9)' > /dev/null 2>&1
 then
   MYOPTS="-O1"
 fi
 
 # Linker
-printf 'checking for ld... '
-if which ld | grep '/ld$' > /dev/null 2>&1
+AC_CHECK_TOOL(LD, ld, no)
+if test "$LD" = "no"
 then
-  LD=`which ld`
-  printf '%s\n' "$LD"
-else
-  printf 'no\n'
   printf '#================================================================\n' 1>&2
   printf '# WARNING: ld is not found in PATH.\n' 1>&2
   printf '#================================================================\n' 1>&2
 fi
 
 # Archiver
-printf 'checking for ar... '
-if which ar | grep '/ar$' > /dev/null 2>&1
+AC_CHECK_TOOL(AR, ar, no)
+if test "$AR" = "no"
 then
-  AR=`which ar`
-  printf '%s\n' "$AR"
-else
-  printf 'no\n'
   printf '#================================================================\n' 1>&2
   printf '# WARNING: ar is not found in PATH.\n' 1>&2
   printf '#================================================================\n' 1>&2
--- a/ruby/configure.in
+++ b/ruby/configure.in
@@ -5,15 +5,6 @@
 # Targets
 AC_INIT(qdbm-ruby, 1.0.0)
 
-# Building paths
-pathtmp="$PATH"
-PATH="$HOME/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
-PATH="$PATH:/usr/ccs/bin:/usr/ucb:/usr/xpg4/bin:/usr/xpg6/bin:$pathtmp"
-LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LIBRARY_PATH"
-LD_LIBRARY_PATH="$HOME/lib:/usr/local/lib:$LD_LIBRARY_PATH"
-CPATH="$HOME/include:/usr/local/include:$CPATH"
-export PATH LIBRARY_PATH LD_LIBRARY_PATH CPATH
-
 # Setting the default prefix
 if test "$prefix" = NONE
 then