google · Mizux · Nov 18, 2025 · Nov 17, 2025 · Nov 17, 2025
diff --git a/.dockerignore b/.dockerignore
@@ -42,6 +42,7 @@ CONTRIBUTING.md
 #LICENSE-2.0.txt
 
 # Native CMake/Make build
+.cache/
 dependencies/sources
 dependencies/install
 ortools/gen

diff --git a/cmake/Makefile b/cmake/Makefile
@@ -159,6 +159,7 @@ help:
 	@echo
 	@echo -e "\t${BOLD}NOCACHE=1${RESET}: use 'docker build --no-cache' when building container (default use cache)."
 	@echo -e "\t${BOLD}VERBOSE=1${RESET}: use 'docker build --progress=plain' when building container."
+	@echo -e "\t${BOLD}CMAKE_BUILD_PARALLEL_LEVEL=4${RESET}: number of concurrent processes to use when building."
 	@echo
 	@echo -e "branch: $(BRANCH)"
 	@echo -e "sha1: $(SHA1)"
@@ -190,6 +191,10 @@ ifdef VERBOSE
 DOCKER_BUILD_CMD := ${DOCKER_BUILD_CMD} --progress=plain
 DOCKER_BUILDX_CMD := ${DOCKER_BUILDX_CMD} --progress=plain
 endif
+ifdef CMAKE_BUILD_PARALLEL_LEVEL
+DOCKER_BUILD_CMD := ${DOCKER_BUILD_CMD} --build-arg CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL}
+DOCKER_BUILDX_CMD := ${DOCKER_BUILDX_CMD} --build-arg CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL}
+endif
 DOCKER_RUN_CMD := docker run --rm --init --net=host
 
 # Currently supported distro

diff --git a/cmake/docker/almalinux/cpp.Dockerfile b/cmake/docker/almalinux/cpp.Dockerfile
@@ -6,6 +6,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=ON
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/almalinux/dotnet.Dockerfile b/cmake/docker/almalinux/dotnet.Dockerfile
@@ -14,6 +14,9 @@ WORKDIR /home/project
 COPY . .
 RUN sed -i 's/\(<SignAssembly>\).*\(<\/SignAssembly>\)/\1false\2/' ortools/dotnet/Google.OrTools*.csproj.in
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -version
 RUN cmake -S. -Bbuild -DBUILD_DOTNET=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/almalinux/java.Dockerfile b/cmake/docker/almalinux/java.Dockerfile
@@ -11,6 +11,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_JAVA=ON -DSKIP_GPG=ON \
  -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/almalinux/python.Dockerfile b/cmake/docker/almalinux/python.Dockerfile
@@ -12,6 +12,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_PYTHON=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/alpine/cpp.Dockerfile b/cmake/docker/alpine/cpp.Dockerfile
@@ -6,6 +6,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=ON
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/alpine/dotnet.Dockerfile b/cmake/docker/alpine/dotnet.Dockerfile
@@ -10,6 +10,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -version
 RUN cmake -S. -Bbuild -DBUILD_DOTNET=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/alpine/java.Dockerfile b/cmake/docker/alpine/java.Dockerfile
@@ -7,6 +7,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_JAVA=ON -DSKIP_GPG=ON \
  -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/alpine/python.Dockerfile b/cmake/docker/alpine/python.Dockerfile
@@ -10,6 +10,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_PYTHON=ON -DVENV_USE_SYSTEM_SITE_PACKAGES=ON \
  -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/archlinux/cpp.Dockerfile b/cmake/docker/archlinux/cpp.Dockerfile
@@ -6,6 +6,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=ON
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/archlinux/dotnet.Dockerfile b/cmake/docker/archlinux/dotnet.Dockerfile
@@ -8,6 +8,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DOTNET=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/archlinux/java.Dockerfile b/cmake/docker/archlinux/java.Dockerfile
@@ -7,6 +7,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_JAVA=ON -DSKIP_GPG=ON \
  -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/archlinux/python.Dockerfile b/cmake/docker/archlinux/python.Dockerfile
@@ -11,6 +11,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_PYTHON=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/debian/cpp.Dockerfile b/cmake/docker/debian/cpp.Dockerfile
@@ -6,6 +6,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=ON
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/debian/dotnet.Dockerfile b/cmake/docker/debian/dotnet.Dockerfile
@@ -17,6 +17,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -version
 RUN cmake -S. -Bbuild -DBUILD_DOTNET=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/debian/java.Dockerfile b/cmake/docker/debian/java.Dockerfile
@@ -10,6 +10,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_JAVA=ON -DSKIP_GPG=ON \
  -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/debian/python.Dockerfile b/cmake/docker/debian/python.Dockerfile
@@ -16,6 +16,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_PYTHON=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/fedora/cpp.Dockerfile b/cmake/docker/fedora/cpp.Dockerfile
@@ -6,6 +6,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=ON
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/fedora/dotnet.Dockerfile b/cmake/docker/fedora/dotnet.Dockerfile
@@ -11,6 +11,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -version
 RUN cmake -S. -Bbuild -DBUILD_DOTNET=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/fedora/java.Dockerfile b/cmake/docker/fedora/java.Dockerfile
@@ -9,6 +9,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_JAVA=ON -DSKIP_GPG=ON \
  -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/fedora/python.Dockerfile b/cmake/docker/fedora/python.Dockerfile
@@ -9,6 +9,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_PYTHON=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/glop/Dockerfile b/cmake/docker/glop/Dockerfile
@@ -14,6 +14,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=ON -DBUILD_CXX=OFF -DBUILD_GLOP=ON
 RUN cmake --build build --target all -j 4 -v

diff --git a/cmake/docker/opensuse/cpp.Dockerfile b/cmake/docker/opensuse/cpp.Dockerfile
@@ -6,6 +6,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=ON
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/opensuse/dotnet.Dockerfile b/cmake/docker/opensuse/dotnet.Dockerfile
@@ -17,6 +17,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -version
 RUN cmake -S. -Bbuild -DBUILD_DOTNET=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/opensuse/java.Dockerfile b/cmake/docker/opensuse/java.Dockerfile
@@ -10,6 +10,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_JAVA=ON -DSKIP_GPG=ON \
  -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/opensuse/python.Dockerfile b/cmake/docker/opensuse/python.Dockerfile
@@ -12,6 +12,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_PYTHON=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/rockylinux/cpp.Dockerfile b/cmake/docker/rockylinux/cpp.Dockerfile
@@ -6,6 +6,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=ON
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/rockylinux/dotnet.Dockerfile b/cmake/docker/rockylinux/dotnet.Dockerfile
@@ -14,6 +14,9 @@ WORKDIR /home/project
 COPY . .
 RUN sed -i 's/\(<SignAssembly>\).*\(<\/SignAssembly>\)/\1false\2/' ortools/dotnet/Google.OrTools*.csproj.in
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -version
 RUN cmake -S. -Bbuild -DBUILD_DOTNET=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/rockylinux/java.Dockerfile b/cmake/docker/rockylinux/java.Dockerfile
@@ -11,6 +11,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_JAVA=ON -DSKIP_GPG=ON \
  -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/rockylinux/python.Dockerfile b/cmake/docker/rockylinux/python.Dockerfile
@@ -12,6 +12,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_PYTHON=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/system_deps/cpp.Dockerfile b/cmake/docker/system_deps/cpp.Dockerfile
@@ -6,6 +6,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=OFF \
  -DUSE_COINOR=ON \

diff --git a/cmake/docker/system_deps/dotnet.Dockerfile b/cmake/docker/system_deps/dotnet.Dockerfile
@@ -8,6 +8,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=OFF \
  -DUSE_COINOR=ON \

diff --git a/cmake/docker/system_deps/java.Dockerfile b/cmake/docker/system_deps/java.Dockerfile
@@ -7,6 +7,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=OFF \
  -DUSE_COINOR=ON \

diff --git a/cmake/docker/system_deps/python.Dockerfile b/cmake/docker/system_deps/python.Dockerfile
@@ -12,6 +12,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 # Archlinux do not provide pybind11 protobuf package
 RUN cmake -S. -Bbuild -DBUILD_DEPS=OFF \

diff --git a/cmake/docker/ubuntu/cpp.Dockerfile b/cmake/docker/ubuntu/cpp.Dockerfile
@@ -6,6 +6,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_DEPS=ON
 RUN cmake --build build --target all -v

diff --git a/cmake/docker/ubuntu/dotnet.Dockerfile b/cmake/docker/ubuntu/dotnet.Dockerfile
@@ -13,6 +13,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -version
 RUN cmake -S. -Bbuild -DBUILD_DOTNET=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/ubuntu/java.Dockerfile b/cmake/docker/ubuntu/java.Dockerfile
@@ -10,6 +10,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_JAVA=ON -DSKIP_GPG=ON \
  -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF

diff --git a/cmake/docker/ubuntu/python.Dockerfile b/cmake/docker/ubuntu/python.Dockerfile
@@ -16,6 +16,9 @@ FROM env AS devel
 WORKDIR /home/project
 COPY . .
 
+ARG CMAKE_BUILD_PARALLEL_LEVEL
+ENV CMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL:-4}
+
 FROM devel AS build
 RUN cmake -S. -Bbuild -DBUILD_PYTHON=ON -DBUILD_CXX_SAMPLES=OFF -DBUILD_CXX_EXAMPLES=OFF
 RUN cmake --build build --target all -v