diff --git a/l/mingw32-libs/mingw32-libs.SlackBuild b/l/mingw32-libs/mingw32-libs.SlackBuild
index 8c773756..4920f20a 100755
--- a/l/mingw32-libs/mingw32-libs.SlackBuild
+++ b/l/mingw32-libs/mingw32-libs.SlackBuild
@@ -26,15 +26,16 @@
 #
 # Depends: d/mingw32-binutils
 
-# Source package infos
+# Source packages infos (checksums and filenames in `checksums' file)
 VERSION=${VERSION:-3.15.2} # MinGW runtime's version
 BASEURL=${BASEURL:-http://ovh.dl.sourceforge.net/mingw}
 
-# Built package infos
+# Build infos
 NAMETGZ=${NAMETGZ:-mingw32-libs}
 BUILD=${BUILD:-1GGD}
 ARCH=${ARCH:-i486}
-TARGET=${TARGET:-i686-pc-mingw32}
+TARGET=${TARGET:-$ARCH-pc-mingw32}
+JOBS=${JOBS:-1}
 
 # Directories
 TMP=${TMP:-/tmp}
@@ -42,7 +43,7 @@ OUT=${OUT:-$TMP/build}
 PKG=${PKG:-$OUT/$NAMETGZ}
 CWD=$(pwd)
 
-set -e  # Quit if a command returns non-zero
+set -e
 
 # Sanity checks
 if [ $UID -eq 0 ]; then
@@ -53,12 +54,22 @@ if [ ! -d $TMP ]; then
     echo "$TMP does not exist or is not a directory!"
     exit 1
 fi
+if [ ! -d /opt/mingw32 ]; then
+    echo "MinGW32 base directory not found!"
+    exit 1
+fi
+if ! echo $PATH | grep -q /opt/mingw32/bin ; then
+    PATH=$PATH:/opt/mingw32/bin
+fi
 
 # Compilation flags
 case "$ARCH" in
 i?86)
     CPUOPT="-O2 -march=$ARCH -mtune=i686"
     ;;
+x86_64)
+    CPUOPT="-O2 -fPIC"
+    ;;
 *)
     CPUOPT="-O2"
     ;;
@@ -67,7 +78,9 @@ esac
 # Get and verify the source archive
 for archive in $(cut -d' ' -f3 checksums); do
     if [ ! -r $archive ]; then
-        wget "$BASEURL/$archive"
+        rm -f $archive.part
+        wget -vc "$BASEURL/$archive" -O $archive.part
+        mv $archive.part $archive
     fi
 done
 sha1sum -c checksums
@@ -100,9 +113,9 @@ $TMP/mingw32/gcc-*/configure \
   --enable-threads=win32 \
   --disable-win32-registry \
   --with-sysroot=$TMP/mingw32/stage1
-make -j 3
+make -j $JOBS
 make install
-export PATH=$PATH:$TMP/mingw32/stage1/bin
+PATH=$PATH:$TMP/mingw32/stage1/bin
 
 # Compile Win32 API libraries
 cd $TMP/mingw32/w32api-*
@@ -112,7 +125,7 @@ CFLAGS="$CPUOPT" \
   --prefix=/opt/mingw32 \
   --host=$TARGET \
   --build=$ARCH-pc-linux-gnu
-make -j 3
+make -j $JOBS
 make install prefix=$PKG/opt/mingw32
 
 # Compile MinGW runtime
@@ -124,7 +137,7 @@ CFLAGS="-I$PKG/opt/mingw32/include $CPUOPT" \
   --host=$TARGET \
   --build=$ARCH-pc-linux-gnu
 sed -i "s:-Lmingwex:-L$PKG/opt/mingw32/lib -Lmingwex:" Makefile
-make -j 3
+make -j $JOBS
 make install prefix=$PKG/opt/mingw32
 
 # Simulate a standard tree under /opt/mingw32