diff --git a/config b/config
index 92277a3..a6c70a0 100644
--- a/config
+++ b/config
@@ -42,6 +42,7 @@ else
     fi
 fi
 
+# ============ emscripten ==============
 
 # stable
 # export EMFLAVOUR=3.1.34
@@ -53,8 +54,26 @@ fi
 #export EMFLAVOUR=${EMFLAVOUR:latest}
 export EMFLAVOUR=${EMFLAVOUR:-tot}
 
+# ============== wasi sdk ===============
+
 # stable
 WASI_SDK=${WASI_SDK:-20}
+WASI_URL=https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${WASI_SDK}/wasi-sdk-${WASI_SDK}.0-linux.tar.gz
+
+WASISDK="${SDKROOT}/wasisdk"
+
+
+# =============== Nimrod ====================
+
+# stable
+NIM_VERSION=nim-2.0.2
+NIM_URL=https://nim-lang.org/download/${NIM_VERSION}-linux_x64.tar.xz
+
+
+NIM_VERSION=nim-git
+NIM_URL=https://github.com/nim-lang/Nim
+
+NIMSDK=${NIMSDK:-"${SDKROOT}/nimsdk"}
 
 
 # base wasm features pure is "mvp" , "bi" is bigint
@@ -85,7 +104,22 @@ then
     echo -n
 else
     OLDPATH=${PATH}
-    PATH=/usr/local/bin:/usr/bin:/opt/bin:/bin
+
+    PATH=/usr/bin:/bin
+    for extrabin in /usr/local/bin /opt/bin
+    do
+        if echo $PATH|grep -q ":$extrabin"
+        then
+            continue
+        fi
+
+        if [ -d $extrabin ]
+        then
+            PATH=$extrabin:$PATH
+        fi
+    done
+
+
     # this is python used for emsdk : ${SYS_PYTHON} -> ${EMSDK_PYTHON}
     for py in 10 9 8 7
     do
@@ -99,6 +133,7 @@ else
         fi
     done
 
+    export GITGET="git clone --recursive --no-tags --depth 1 --single-branch --branch"
     export LD_LIBRARY_PATH="${HOST_PREFIX}/lib:$LD_LIBRARY_PATH"
-    export PATH="${HOST_PREFIX}/bin:$OLDPATH"
+    export PATH="${HOST_PREFIX}/bin:$PATH:$OLDPATH"
 fi
diff --git a/python-nim-sdk.sh b/python-nim-sdk.sh
new file mode 100755
index 0000000..cbba50b
--- /dev/null
+++ b/python-nim-sdk.sh
@@ -0,0 +1,185 @@
+#!/bin/bash
+
+SDKROOT=${SDKROOT:-/opt/python-wasm-sdk}
+CONFIG=$(realpath ${CONFIG:-config})
+. $CONFIG
+
+if [ -d ${NIMSDK} ]
+then
+    echo "
+
+
+
+    will not overwrite existing working directory
+        NIMSDK=${NIMSDK}
+
+
+
+"
+else
+    mkdir ${NIMSDK}
+fi
+
+
+pushd ${NIMSDK}
+    if [ -d $NIM_VERSION/bin ]
+    then
+        echo "
+
+    will not overwrite existing Nim build found in
+        ${NIMSDK}/$NIM_VERSION/bin
+
+
+    "
+    else
+        if echo $NIM_URL|grep -q nim-lang\.org
+        then
+            echo ERROR download/install release from $NIM_URL
+        else
+            $GITGET devel $NIM_URL $NIM_VERSION
+            pushd $NIM_VERSION
+                chmod +x *sh
+                CC=clang CXX=clang++ ./build_all.sh
+            popd
+        fi
+    fi
+
+# --usenimcache
+
+    mkdir -p ${NIMSDK}/nim
+
+    cat > ${NIMSDK}/nim/config.nims <<END
+echo "  ==== python-nim-sdk ======"
+import std/strformat
+
+var ARCH="$(arch)"
+var SDKROOT = getEnv("SDKROOT","${SDKROOT}")
+
+--colors:on
+--threads:off
+
+echo fmt" ==== Panda3D: generic config {ARCH=} from {SDKROOT=} ===="
+--cc:clang
+--os:linux
+
+--define:usemalloc
+--noCppExceptions
+--define:noCppExceptions
+--exceptions:quirky
+
+# gc : bohem => need libgc.so.1
+--gc:orc
+--define:noSignalHandler
+
+#
+--define:static
+
+# better debug but optionnal/tweakable
+--parallelBuild:1
+--opt:speed
+--define:debug
+
+when defined(wasi):
+    echo "  ===== Panda3D: wasi build ======"
+    # overwrite
+    ARCH="wasisdk"
+
+    # needed for compiler
+    --cc:clang
+    --os:linux
+
+    --define:emscripten
+    --define:static
+
+    # component model aka reactor
+    --noMain
+
+    --cpu:wasm32
+    switch("clibdir", fmt"{SDKROOT}/devices/{ARCH}/usr/lib/wasm32-wasi")
+
+
+    switch("passC", fmt"-m32 -Djmp_buf=int")
+    switch("passC", "-Os -g3 -mllvm -inline-threshold=1")
+
+    switch("passL","-lstdc++ ")
+
+    # more compat but in the long term workaround Panda3D instead
+    # wasi emulations
+    switch("passC", "-D_GNU_SOURCE")
+    switch("passC", "-D_WASI_EMULATED_MMAN -D_WASI_EMULATED_SIGNAL -D_WASI_EMULATED_PROCESS_CLOCKS -D_WASI_EMULATED_GETPID")
+    switch("passL", "-lwasi-emulated-getpid -lwasi-emulated-mman -lwasi-emulated-signal -lwasi-emulated-process-clocks")
+
+
+    # don't use _start/main but _initialize instead
+    switch("passL", "-Wl,--export-all -mexec-model=reactor")
+
+    # better debug but optionnal/tweakable
+    --parallelBuild:1
+    --opt:none
+
+else:
+    echo fmt"  ===== Panda3D: native {ARCH} build ======"
+    switch("passL", "-lfreetype -lharfbuzz")
+    # -lfftw3 -lassimp")
+
+# static
+switch("passL", "-lp3tinydisplay")
+# common
+switch("passL", "-lc -lz")
+
+# only for script gen which does not pass cincludes
+# --passC:-I/opt/python-wasm-sdk/devices/${ARCH}/usr/include/panda3d
+# --passL:-L${SDKROOT}/devices/${ARCH}/usr/lib
+
+
+switch("nimcache", fmt"{SDKROOT}/nimsdk/cache.{ARCH}")
+switch("clibdir", fmt"{SDKROOT}/devices/{ARCH}/usr/lib")
+switch("cincludes", fmt"{SDKROOT}/devices/{ARCH}/usr/include/panda3d")
+
+switch("out", fmt"out.{ARCH}")
+
+
+
+END
+
+    cat > nimsdk_env.sh <<END
+if [[ -z \${NIMSDK_ENV+z} ]]
+then
+    export NIMSDK_ENV=true
+    export SDKROOT=$SDKROOT
+    . $CONFIG
+    . $WASISDK/wasisdk_env.sh
+    export XDG_CONFIG_HOME=${NIMSDK}
+    export NIMBLE_DIR=${NIMSDK}/pkg
+    export PATH=${NIMSDK}/${NIM_VERSION}/bin:$PATH
+    echo "
+
+    * using nimsdk from \$(realpath \${NIMSDK}/\${NIM_VERSION}/bin)
+            with sys python \$SYS_PYTHON and host python \$HPY
+        toolchain file CMAKE_TOOLCHAIN_FILE=\${CMAKE_TOOLCHAIN_FILE}
+        install prefix PREFIX=\${PREFIX}
+
+        Nim from $NIMSDK/$NIM_VERSION/bin
+
+        SDKROOT=$SDKROOT
+        NIMSDK=$NIMSDK
+        NIMBLE_DIR=\$NIMBLE_DIR
+        PATH=$PATH
+
+        clang=\$(which clang)
+        clang++=\$(which clang++)
+
+"
+
+parse_git_branch() {
+     git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
+}
+    export PS1="[PyDK:nim]  \[\e[32m\]\w \[\e[91m\]\$(parse_git_branch)\[\e[00m\]\$ "
+
+else
+    echo "nimsdk: config already set !" 1>&2
+fi
+END
+
+popd
+
diff --git a/python-wasi-sdk.sh b/python-wasi-sdk.sh
index eb74af6..538dc01 100755
--- a/python-wasi-sdk.sh
+++ b/python-wasi-sdk.sh
@@ -18,13 +18,16 @@ if echo $0|grep -q python-wasm-sdk
 then
     echo " * adding emsdk to wasm-sdk"
     emsdk=true
+    wasisdk=false
+    nimsdk=false
 else
     emsdk=false
     BUILDS=3.12
+    echo " * adding wasi-sdk to wasm-sdk"
+    wasisdk=true
+    nimsdk=true
 fi
 
-echo " * adding wasi-sdk to wasm-sdk"
-wasisdk=true
 
 if [ -d ${SDKROOT} ]
 then
@@ -40,18 +43,18 @@ ORIGIN=$(pwd)
 
 # 3.12 3.11 3.10
 
-BUILDS=${BUILDS:-3.11 3.12 3.13}
+BUILDS=${BUILDS:-3.11 3.13 3.12}
 
 for PYBUILD in $BUILDS
 do
     cd "$ORIGIN"
 
-    if echo $PYBUILD|grep -q 12$
-    then
-        wasisdk=true
-    else
-        wasisdk=false
-    fi
+#    if echo $PYBUILD|grep -q 12$
+#    then
+#        wasisdk=true
+#    else
+#        wasisdk=false
+#    fi
 
     if [ -f ${SDKROOT}/dev ]
     then
@@ -94,6 +97,19 @@ do
 
         fi
 
+        cat > /opt/python-wasm-sdk/devices/$(arch)/usr/bin/py <<END
+#!/bin/bash
+export XDG_SESSION_TYPE=x11
+export SDKROOT=${SDKROOT}
+export PYTHONPATH=/data/git/pygbag/src:/data/git/platform_wasm:${PYTHONPATH}
+export PYTHONPYCACHEPREFIX=$PYTHONPYCACHEPREFIX
+export HOME=${SDKROOT}
+export PATH=${SDKROOT}/devices/$(arch)/usr/bin:\$PATH
+export LD_LIBRARY_PATH=${SDKROOT}/devices/$(arch)/usr/lib:${SDKROOT}/devices/$(arch)/usr/lib64:$LD_LIBRARY_PATH
+${SDKROOT}/devices/$(arch)/usr/bin/python\${PYBUILD:-$PYBUILD} $@
+END
+        chmod + /opt/python-wasm-sdk/devices/$(arch)/usr/bin/py
+
 
         if $emsdk
         then
@@ -173,6 +189,11 @@ END
 
         fi
 
+        if $nimsdk
+        then
+            ${SDKROOT}/python-nim-sdk.sh
+        fi
+
         . ${SDKROOT}/scripts/pack-sdk.sh
 
     else
diff --git a/scripts/cpython-build-wasisdk.sh b/scripts/cpython-build-wasisdk.sh
index 3954b83..7360a7f 100755
--- a/scripts/cpython-build-wasisdk.sh
+++ b/scripts/cpython-build-wasisdk.sh
@@ -8,19 +8,10 @@ pushd ${SDKROOT}
 . ${CONFIG:-config}
 
 
-export PREFIX=${PREFIX:-${SDKROOT}/devices/wasisdk/usr}
+#export PREFIX=${PREFIX:-${SDKROOT}/devices/wasisdk/usr}
 export PYTHON_FOR_BUILD=${PYTHON_FOR_BUILD:-${HPY}}
 
 
-echo "
-
-    * building cpython-wasi ${PREFIX}/bin/python${PYBUILD}.wasm
-        with PYTHON_FOR_BUILD=$PYTHON_FOR_BUILD
-
-" 1>&2
-
-
-
 if [ -f ${PYTHON_FOR_BUILD} ]
 then
     echo found PYTHON_FOR_BUILD=${PYTHON_FOR_BUILD}
@@ -32,8 +23,6 @@ else
     popd
 fi
 
-. ${SDKROOT}/wasisdk/wasisdk_env.sh
-
 
 export LD_LIBRARY_PATH=${SDKROOT}/devices/x86_64/usr/lib:$LD_LIBRARY_PATH
 
@@ -42,9 +31,20 @@ then
 
     PYSRC=${SDKROOT}/src/cpython${PYBUILD}
 
+    . ${SDKROOT}/wasisdk/wasisdk_env.sh
+
+
     echo "
-    * building python wasi from ${PYSRC}
-"
+
+    * building cpython-wasi ${PREFIX}/bin/python${PYBUILD}.wasm
+        from ${PYSRC}
+        with PYTHON_FOR_BUILD=$PYTHON_FOR_BUILD
+        CC=$CC
+        CXX=$CXX
+        CPP=$CPP
+
+" 1>&2
+
 
     mkdir -p ${SDKROOT}/build/cpython-wasi
 
@@ -62,7 +62,7 @@ END
         sed -i 's| -Wl,--stack-first -Wl,--initial-memory=10485760||g' $PYSRC/configure.ac
         sed -i 's| -Wl,--stack-first -Wl,--initial-memory=10485760||g' $PYSRC/configure
 
-        CC=clang CXX=clang++ LDSHARED="${SDKROOT}/wasisdk/upstream/bin/wasm-ld --no-entry" CONFIG_SITE=$PYSRC/Tools/wasm/config.site-wasm32-wasisdk \
+        LDSHARED="${SDKROOT}/wasisdk/upstream/bin/wasm-ld --no-entry" CONFIG_SITE=$PYSRC/Tools/wasm/config.site-wasm32-wasisdk \
         $PYSRC/configure -C \
         --with-c-locale-coercion --without-pymalloc --disable-ipv6  --with-ensurepip=no \
         --prefix=${PREFIX} \
diff --git a/wasisdk/wasisdk_env.sh b/wasisdk/wasisdk_env.sh
index 90054bc..f723b65 100755
--- a/wasisdk/wasisdk_env.sh
+++ b/wasisdk/wasisdk_env.sh
@@ -2,17 +2,19 @@
 
 SDKROOT=${SDKROOT:-/opt/python-wasm-sdk}
 
-if [[ -z ${WASISDK+z} ]]
+if [[ -z ${WASISDK_ENV+z} ]]
 then
-
+    export WASISDK_ENV=true
     . ${CONFIG:-${SDKROOT}/config}
 
-    export WASISDK="${SDKROOT}/wasisdk"
+    export ARCH=wasisdk
+    export WASISDK=${WASISDK:-"${SDKROOT}/${ARCH}"}
     export WASI_SDK_PREFIX="${WASISDK}/upstream"
     export WASI_SYSROOT="${WASI_SDK_PREFIX}/share/wasi-sysroot"
 
-    export CMAKE_TOOLCHAIN_FILE=${SDKROOT}/wasisdk/share/cmake/Modules/Platform/WASI.cmake
-    export CMAKE_INSTALL_PREFIX="${SDKROOT}/devices/wasisdk/usr"
+    export CMAKE_TOOLCHAIN_FILE=${WASISDK}/share/cmake/Modules/Platform/WASI.cmake
+    export CMAKE_INSTALL_PREFIX="${SDKROOT}/devices/${ARCH}/usr"
+    export PREFIX=$CMAKE_INSTALL_PREFIX
 
     if [ -d ${WASI_SDK_PREFIX}/bin ]
     then
@@ -29,8 +31,6 @@ then
 
     export PATH="${WASISDK}/bin:${WASI_SDK_PREFIX}/bin:$PATH"
 
-    export PREFIX=$CMAKE_INSTALL_PREFIX
-
     # instruct pkg-config to use wasi target root
     export PKG_CONFIG_PATH="${PREFIX}/lib/pkgconfig:${WASI_SYSROOT}/lib/wasm32-wasi/pkgconfig"