diff --git a/build-aux/check-mescc.sh b/build-aux/check-mescc.sh
index 347e7c1f..bc1a33c9 100755
--- a/build-aux/check-mescc.sh
+++ b/build-aux/check-mescc.sh
@@ -228,6 +228,16 @@ scaffold/tests/stdio/70-printf-simple
 scaffold/tests/stdio/70-printf
 lib/tests/setjmp/80-setjmp
 scaffold/tests/a1-global-no-align
+"
+    # Debian: debugme itoa is broken
+    broken="$broken
+scaffold/tests/47-function-expression
+scaffold/tests/62-array
+scaffold/tests/65-read
+scaffold/tests/85-sizeof
+lib/tests/mes/90-abtod
+lib/tests/mes/90-dtoab
+lib/tests/posix/90-execlp
 "
 fi
 
diff --git a/build-aux/check.sh.in b/build-aux/check.sh.in
index cd8d476c..67247238 100644
--- a/build-aux/check.sh.in
+++ b/build-aux/check.sh.in
@@ -26,7 +26,7 @@ set -e
 
 ./pre-inst-env bash ${srcdest}build-aux/check-boot.sh
 ./pre-inst-env sh ${srcdest}build-aux/check-mes.sh
-./pre-inst-env sh ${srcdest}build-aux/check-mescc.sh
+./pre-inst-env bash ${srcdest}build-aux/check-mescc.sh
 if [ -d $TINYCC_PREFIX/tests/tests2 ] ;then
     ./pre-inst-env sh ${srcdest}build-aux/check-tcc.sh
 fi
diff --git a/build-aux/config.sh b/build-aux/config.sh
index de59582b..d49e5d85 100644
--- a/build-aux/config.sh
+++ b/build-aux/config.sh
@@ -37,6 +37,12 @@ if [ ! "$CC" ]; then
     CC="./pre-inst-env mescc"
 fi
 
+unset CFLAGS
+unset CPPFLAGS
+unset HEX2FLAGS
+unset LDFLAGS
+unset M1FLAGS
+
 export AR
 export CC
 export CFLAGS
diff --git a/build-aux/install.sh.in b/build-aux/install.sh.in
index 64cc693c..36106f87 100644
--- a/build-aux/install.sh.in
+++ b/build-aux/install.sh.in
@@ -25,23 +25,23 @@ set -e
 mes_prefix=@prefix@/share/mes
 
 # use bash or lose if pipes fail
-if [ "$(basename $SHELL)" = bash ]; then
+if [ -n "$BASHOPTS" ]; then
    set -o pipefail
 fi
 
-mkdir -p $DESTDIR@bindir@
+mkdir -p ${DESTDIR}@bindir@
 if [ -f src/x86-mes-mes ]; then
-    cp src/x86-mes-mes $DESTDIR@bindir@/mes
+    cp src/x86-mes-mes ${DESTDIR}@bindir@/mes
 fi
-cp scripts/mescc.scm $DESTDIR@bindir@/mescc.scm
-cp scripts/mescc $DESTDIR@bindir@/mescc
+cp scripts/mescc.scm ${DESTDIR}@bindir@/mescc.scm
+cp scripts/mescc ${DESTDIR}@bindir@/mescc
 
 sed \
     -e "s,^#! /bin/sh,#! @SHELL@," \
-    scripts/diff.scm > $DESTDIR@bindir@/diff.scm
-chmod +x $DESTDIR@bindir@/diff.scm
+    scripts/diff.scm > ${DESTDIR}@bindir@/diff.scm
+chmod +x ${DESTDIR}@bindir@/diff.scm
 
-mkdir -p $DESTDIR@docdir@
+mkdir -p ${DESTDIR}@docdir@
 
 if [ -n "@PERL@" ]\
        && [ -n "@GIT@" ]\
@@ -58,18 +58,12 @@ cp\
     INSTALL\
     NEWS\
     README\
-    $DESTDIR@docdir@
+    ${DESTDIR}@docdir@
 
 if [ -f ChangeLog ]; then
-    cp ChangeLog $DESTDIR@docdir@
+    cp ChangeLog ${DESTDIR}@docdir@
 else
-    cp ChangeLog $DESTDIR@docdir@
-fi
-
-if [ -f ChangeLog ]; then
-    cp ChangeLog @docdir@
-else
-    cp ChangeLog @docdir@
+    cp ChangeLog ${DESTDIR}@docdir@
 fi
 
 mkdir -p $DESTDIR$mes_prefix
diff --git a/configure b/configure
index 520007d1..4f81c7ac 100755
--- a/configure
+++ b/configure
@@ -370,7 +370,7 @@ Some influential environment variables:
          (program-prefix (option-ref options 'program-prefix ""))
          (program-suffix (option-ref options 'program-suffix ""))
          (infodir (option-ref options 'infodir "${prefix}/share/info"))
-         (mandir (option-ref options 'infodir "${prefix}/share/man"))
+         (mandir (option-ref options 'mandir "${prefix}/share/man"))
          (sysconfdir (option-ref options 'sysconfdir "${prefix}/etc"))
 
          (bindir (option-ref options 'bindir "${prefix}/bin"))