diff --git a/contrib/guix/libexec/build_linux.sh b/contrib/guix/libexec/build_linux.sh
index f1b25b52e55..7cf39d4ba9e 100755
--- a/contrib/guix/libexec/build_linux.sh
+++ b/contrib/guix/libexec/build_linux.sh
@@ -8,32 +8,8 @@ set -o errexit -o pipefail
 # shellcheck source=setup.sh
 source "$(dirname "${BASH_SOURCE[0]}")/setup.sh"
 
-# Set environment variables to point the NATIVE toolchain to the right
-# includes/libs
-NATIVE_GCC="$(store_path gcc-toolchain)"
-
-# Set native toolchain
-build_CC="${NATIVE_GCC}/bin/gcc -isystem ${NATIVE_GCC}/include"
-build_CXX="${NATIVE_GCC}/bin/g++ -isystem ${NATIVE_GCC}/include/c++ -isystem ${NATIVE_GCC}/include"
-
-NATIVE_GCC_STATIC="$(store_path gcc-toolchain static)"
-export LIBRARY_PATH="${NATIVE_GCC}/lib:${NATIVE_GCC_STATIC}/lib"
-
-# Set environment variables to point the CROSS toolchain to the right
-# includes/libs for $HOST
-CROSS_GLIBC="$(store_path "glibc-cross-${HOST}")"
-CROSS_GLIBC_STATIC="$(store_path "glibc-cross-${HOST}" static)"
-CROSS_KERNEL="$(store_path "linux-libre-headers-cross-${HOST}")"
-CROSS_GCC="$(store_path "gcc-cross-${HOST}")"
-CROSS_GCC_LIB_STORE="$(store_path "gcc-cross-${HOST}" lib)"
-CROSS_GCC_LIBS=( "${CROSS_GCC_LIB_STORE}/lib/gcc/${HOST}"/* ) # This expands to an array of directories...
-CROSS_GCC_LIB="${CROSS_GCC_LIBS[0]}" # ...we just want the first one (there should only be one)
-
-export CROSS_C_INCLUDE_PATH="${CROSS_GCC_LIB}/include:${CROSS_GCC_LIB}/include-fixed:${CROSS_GLIBC}/include:${CROSS_KERNEL}/include"
-export CROSS_CPLUS_INCLUDE_PATH="${CROSS_GCC}/include/c++:${CROSS_GCC}/include/c++/${HOST}:${CROSS_GCC}/include/c++/backward:${CROSS_C_INCLUDE_PATH}"
-export CROSS_LIBRARY_PATH="${CROSS_GCC_LIB_STORE}/lib:${CROSS_GCC_LIB}:${CROSS_GLIBC}/lib:${CROSS_GLIBC_STATIC}/lib"
-
-check_cross_paths "${CROSS_C_INCLUDE_PATH}:${CROSS_CPLUS_INCLUDE_PATH}:${CROSS_LIBRARY_PATH}"
+# setup gcc toolchain
+gcc_toolchain
 
 # Build the depends tree, overriding variables that assume multilib gcc
 make -C depends --jobs="$JOBS" HOST="$HOST" \
diff --git a/contrib/guix/libexec/build_linux_gui.sh b/contrib/guix/libexec/build_linux_gui.sh
index 218bc0a952c..33aa876868d 100755
--- a/contrib/guix/libexec/build_linux_gui.sh
+++ b/contrib/guix/libexec/build_linux_gui.sh
@@ -8,32 +8,8 @@ set -o errexit -o pipefail
 # shellcheck source=setup.sh
 source "$(dirname "${BASH_SOURCE[0]}")/setup.sh"
 
-# Set environment variables to point the NATIVE toolchain to the right
-# includes/libs
-NATIVE_GCC="$(store_path gcc-toolchain)"
-
-# Set native toolchain
-build_CC="${NATIVE_GCC}/bin/gcc -isystem ${NATIVE_GCC}/include"
-build_CXX="${NATIVE_GCC}/bin/g++ -isystem ${NATIVE_GCC}/include/c++ -isystem ${NATIVE_GCC}/include"
-
-NATIVE_GCC_STATIC="$(store_path gcc-toolchain static)"
-export LIBRARY_PATH="${NATIVE_GCC}/lib:${NATIVE_GCC_STATIC}/lib"
-
-# Set environment variables to point the CROSS toolchain to the right
-# includes/libs for $HOST
-CROSS_GLIBC="$(store_path "glibc-cross-${HOST}")"
-CROSS_GLIBC_STATIC="$(store_path "glibc-cross-${HOST}" static)"
-CROSS_KERNEL="$(store_path "linux-libre-headers-cross-${HOST}")"
-CROSS_GCC="$(store_path "gcc-cross-${HOST}")"
-CROSS_GCC_LIB_STORE="$(store_path "gcc-cross-${HOST}" lib)"
-CROSS_GCC_LIBS=( "${CROSS_GCC_LIB_STORE}/lib/gcc/${HOST}"/* ) # This expands to an array of directories...
-CROSS_GCC_LIB="${CROSS_GCC_LIBS[0]}" # ...we just want the first one (there should only be one)
-
-export CROSS_C_INCLUDE_PATH="${CROSS_GCC_LIB}/include:${CROSS_GCC_LIB}/include-fixed:${CROSS_GLIBC}/include:${CROSS_KERNEL}/include"
-export CROSS_CPLUS_INCLUDE_PATH="${CROSS_GCC}/include/c++:${CROSS_GCC}/include/c++/${HOST}:${CROSS_GCC}/include/c++/backward:${CROSS_C_INCLUDE_PATH}"
-export CROSS_LIBRARY_PATH="${CROSS_GCC_LIB_STORE}/lib:${CROSS_GCC_LIB}:${CROSS_GLIBC}/lib:${CROSS_GLIBC_STATIC}/lib"
-
-check_cross_paths "${CROSS_C_INCLUDE_PATH}:${CROSS_CPLUS_INCLUDE_PATH}:${CROSS_LIBRARY_PATH}"
+# setup gcc toolchain
+gcc_toolchain
 
 # Build the depends tree, overriding variables that assume multilib gcc
 make -C depends --jobs="$JOBS" HOST="$HOST" \
diff --git a/contrib/guix/libexec/setup.sh b/contrib/guix/libexec/setup.sh
index 031d5904161..2e3eb159838 100755
--- a/contrib/guix/libexec/setup.sh
+++ b/contrib/guix/libexec/setup.sh
@@ -86,6 +86,37 @@ glibc_dynamic_linker() {
     esac
 }
 
+gcc_toolchain() {
+    # Set environment variables to point the NATIVE toolchain to the right
+    # includes/libs
+    local NATIVE_GCC NATIVE_GCC_STATIC CROSS_GLIBC CROSS_GLIBC_STATIC CROSS_KERNEL CROSS_GCC CROSS_GCC_LIB_STORE CROSS_GCC_LIBS CROSS_GCC_LIB
+
+    NATIVE_GCC="$(store_path gcc-toolchain)"
+
+    # Set native toolchain
+    export build_CC="${NATIVE_GCC}/bin/gcc -isystem ${NATIVE_GCC}/include"
+    export build_CXX="${NATIVE_GCC}/bin/g++ -isystem ${NATIVE_GCC}/include/c++ -isystem ${NATIVE_GCC}/include"
+
+    NATIVE_GCC_STATIC="$(store_path gcc-toolchain static)"
+    export LIBRARY_PATH="${NATIVE_GCC}/lib:${NATIVE_GCC_STATIC}/lib"
+
+    # Set environment variables to point the CROSS toolchain to the right
+    # includes/libs for $HOST
+    CROSS_GLIBC="$(store_path "glibc-cross-${HOST}")"
+    CROSS_GLIBC_STATIC="$(store_path "glibc-cross-${HOST}" static)"
+    CROSS_KERNEL="$(store_path "linux-libre-headers-cross-${HOST}")"
+    CROSS_GCC="$(store_path "gcc-cross-${HOST}")"
+    CROSS_GCC_LIB_STORE="$(store_path "gcc-cross-${HOST}" lib)"
+    CROSS_GCC_LIBS=( "${CROSS_GCC_LIB_STORE}/lib/gcc/${HOST}"/* ) # This expands to an array of directories...
+    CROSS_GCC_LIB="${CROSS_GCC_LIBS[0]}" # ...we just want the first one (there should only be one)
+
+    export CROSS_C_INCLUDE_PATH="${CROSS_GCC_LIB}/include:${CROSS_GCC_LIB}/include-fixed:${CROSS_GLIBC}/include:${CROSS_KERNEL}/include"
+    export CROSS_CPLUS_INCLUDE_PATH="${CROSS_GCC}/include/c++:${CROSS_GCC}/include/c++/${HOST}:${CROSS_GCC}/include/c++/backward:${CROSS_C_INCLUDE_PATH}"
+    export CROSS_LIBRARY_PATH="${CROSS_GCC_LIB_STORE}/lib:${CROSS_GCC_LIB}:${CROSS_GLIBC}/lib:${CROSS_GLIBC_STATIC}/lib"
+
+    check_cross_paths "${CROSS_C_INCLUDE_PATH}:${CROSS_CPLUS_INCLUDE_PATH}:${CROSS_LIBRARY_PATH}"
+}
+
 llvm_toolchain() {
     local CLANG_TOOLCHAIN LIB_CXX