From b279eb9263139cd7eb485447001db8d6c20125f4 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 13:56:16 +0200
Subject: [PATCH 01/17] pkg-config further experiments

---
 cpp/dolfinx/CMakeLists.txt       | 11 ++++++++++-
 cpp/test/pkgconfig-test/main.cpp | 24 ++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 cpp/test/pkgconfig-test/main.cpp

diff --git a/cpp/dolfinx/CMakeLists.txt b/cpp/dolfinx/CMakeLists.txt
index 50c0a6da93..b3054fd5e5 100644
--- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -271,7 +271,16 @@ install(
 # Generate pkg-config file and install it
 
 # Define packages that should be required by pkg-config file
-set(PKG_REQUIRES "")
+set(PKG_REQUIRES "spdlog")
+
+if(TARGET PkgConfig::PETSC)
+  list(APPEND PKG_REQUIRES ${PETSC_MODULE_NAME})
+endif()
+if(TARGET PkgConfig::SLEPC)
+  list(APPEND PKG_REQUIRES ${SLEPC_MODULE_NAME})
+endif()
+
+string(REPLACE ";" " " PKG_REQUIRES "${PKG_REQUIRES}")
 
 # Get link libraries and includes
 get_target_property(
diff --git a/cpp/test/pkgconfig-test/main.cpp b/cpp/test/pkgconfig-test/main.cpp
new file mode 100644
index 0000000000..7b8d8aed4a
--- /dev/null
+++ b/cpp/test/pkgconfig-test/main.cpp
@@ -0,0 +1,24 @@
+// Copyright (C) 2025 Jack S. Hale
+//
+// This file is part of DOLFINx (https://www.fenicsproject.org)
+//
+// SPDX-License-Identifier:    LGPL-3.0-or-later
+
+#include <dolfinx/common/log.h>
+#include <dolfinx/mesh/generation.h>
+#include <mpi.h>
+
+int main(int argc, char* argv[])
+{
+  MPI_Init(&argc, &argv);
+  dolfinx::init_logging(argc, argv);
+
+  {
+    auto mesh = dolfinx::mesh::create_rectangle(
+        MPI_COMM_WORLD, {{{0.0, 0.0}, {1.0, 1.0}}}, {8, 8},
+        dolfinx::mesh::CellType::triangle);
+  }
+
+  MPI_Finalize();
+  return 0;
+}

From 194600065b94f5dcccc51fe020ff3d3abfe891dd Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 16:37:45 +0200
Subject: [PATCH 02/17] pc-config test runs

---
 cpp/cmake/templates/dolfinx.pc.in | 2 +-
 cpp/dolfinx/CMakeLists.txt        | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/cpp/cmake/templates/dolfinx.pc.in b/cpp/cmake/templates/dolfinx.pc.in
index b2648c195e..2020e71019 100644
--- a/cpp/cmake/templates/dolfinx.pc.in
+++ b/cpp/cmake/templates/dolfinx.pc.in
@@ -12,4 +12,4 @@ Version: @DOLFINX_VERSION@
 Requires: @PKG_REQUIRES@
 Conflicts:
 Libs: @PKG_LINKFLAGS@ -L${libdir} -ldolfinx
-Cflags: @PKG_CXXFLAGS@ -DDOLFINX_VERSION=\"@DOLFINX_VERSION@\" ${definitions} -I${includedir} @PKG_INCLUDES@
+Cflags: @PKG_CXXFLAGS@ ${definitions} -I${includedir} @PKG_INCLUDES@
diff --git a/cpp/dolfinx/CMakeLists.txt b/cpp/dolfinx/CMakeLists.txt
index b3054fd5e5..9c65d16ef9 100644
--- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -291,8 +291,13 @@ get_target_property(
 get_target_property(
   PKGCONFIG_DOLFINX_INCLUDE_DIRECTORIES
   dolfinx
-  INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
+  INTERFACE_INCLUDE_DIRECTORIES
 )
+if(PKGCONFIG_DOLFINX_INCLUDE_DIRECTORIES)
+  list(FILTER PKGCONFIG_DOLFINX_INCLUDE_DIRECTORIES EXCLUDE REGEX "^\\$<|>$")
+else()
+  set(PKGCONFIG_DOLFINX_INCLUDE_DIRECTORIES "")
+endif()
 
 # Add imported targets to lists for creating pkg-config file
 set(PKGCONFIG_DOLFINX_LIBS)

From 4b3e7000a2ee5f1277a5954c607fe33e4a0ce575 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 16:46:13 +0200
Subject: [PATCH 03/17] Get right C++ standard

---
 cpp/dolfinx/CMakeLists.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/cpp/dolfinx/CMakeLists.txt b/cpp/dolfinx/CMakeLists.txt
index 9c65d16ef9..a52f77ac1c 100644
--- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -279,6 +279,9 @@ endif()
 if(TARGET PkgConfig::SLEPC)
   list(APPEND PKG_REQUIRES ${SLEPC_MODULE_NAME})
 endif()
+if(TARGET PkgConfig::SUPERLU_DIST)
+  list(APPEND PKG_REQUIRES ${SUPERLU_DIST_MODULE_NAME})
+endif()
 
 string(REPLACE ";" " " PKG_REQUIRES "${PKG_REQUIRES}")
 
@@ -377,6 +380,10 @@ endforeach()
 
 # Convert compiler flags and definitions into space separated strings
 string(REPLACE ";" " " PKG_CXXFLAGS "${CMAKE_CXX_FLAGS}")
+get_target_property(_cxx_standard dolfinx CXX_STANDARD)
+if(_cxx_standard)
+  string(APPEND PKG_CXXFLAGS " -std=c++${_cxx_standard}")
+endif()
 string(REPLACE ";" " " PKG_LINKFLAGS "${CMAKE_EXE_LINKER_FLAGS}")
 
 # Convert libraries to -L<libdir> -l<lib> form

From c3556cbb04a0db96e9c28f79f76c9478c75a5f17 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 16:50:16 +0200
Subject: [PATCH 04/17] Add unit testing

---
 .github/workflows/ccpp.yml | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index a3c1070b66..99c8676a9e 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -124,6 +124,12 @@ jobs:
           sudo cmake --install .
           sudo ldconfig
 
+      - name: Run pkg-config test (C++)
+        working-directory: cpp/test/pkgconfig-test
+        run: |
+          make
+          make run
+
       - name: Run tests via target (C++, serial and parallel)
         working-directory: cpp/build
         run: cmake --build . --target test
@@ -222,6 +228,13 @@ jobs:
           cmake -B build -S . -DCMAKE_BUILD_TYPE=Developer -GNinja
           cmake --build build
 
+      - name: Run pkg-config test (C++)
+        working-directory: cpp/test/pkgconfig-test
+        run: |
+          export PKG_CONFIG_PATH=$PETSC_DIR/$PETSC_ARCH/lib/pkgconfig:$PKG_CONFIG_PATH
+          make
+          make run
+
       - name: Run tests (C++, serial)
         working-directory: cpp/test/build
         run: ctest -V --output-on-failure -R unittests_np_1

From dd77ae2328b371a1404cfbfba76fa668208cde1f Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 17:21:24 +0200
Subject: [PATCH 05/17] Rename folder

---
 cpp/test/{pkgconfig-test => pkgconfig}/main.cpp | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename cpp/test/{pkgconfig-test => pkgconfig}/main.cpp (100%)

diff --git a/cpp/test/pkgconfig-test/main.cpp b/cpp/test/pkgconfig/main.cpp
similarity index 100%
rename from cpp/test/pkgconfig-test/main.cpp
rename to cpp/test/pkgconfig/main.cpp

From dffec995421e8e0db4a9a22905df958731ffeecd Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 17:21:37 +0200
Subject: [PATCH 06/17] Add Makefile

---
 cpp/test/pkgconfig/Makefile | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 cpp/test/pkgconfig/Makefile

diff --git a/cpp/test/pkgconfig/Makefile b/cpp/test/pkgconfig/Makefile
new file mode 100644
index 0000000000..7569c63d4e
--- /dev/null
+++ b/cpp/test/pkgconfig/Makefile
@@ -0,0 +1,14 @@
+CXX      = mpicxx
+CXXFLAGS = $(shell pkg-config --cflags dolfinx)
+LDFLAGS  = $(shell pkg-config --libs dolfinx) -Wl,-rpath,$(shell pkg-config --variable=libdir dolfinx)
+
+main: main.cpp
+	$(CXX) $(CXXFLAGS) $< -o $@ $(LDFLAGS)
+
+run: main
+	mpiexec -np 1 ./main
+
+clean:
+	rm -f main
+
+.PHONY: run clean

From bdfd56d201ae758c75d3881b603784f1bade30a4 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 17:25:27 +0200
Subject: [PATCH 07/17] Split out into build and link steps

---
 cpp/test/pkgconfig/Makefile | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/cpp/test/pkgconfig/Makefile b/cpp/test/pkgconfig/Makefile
index 7569c63d4e..8daaac6f66 100644
--- a/cpp/test/pkgconfig/Makefile
+++ b/cpp/test/pkgconfig/Makefile
@@ -1,14 +1,18 @@
 CXX      = mpicxx
 CXXFLAGS = $(shell pkg-config --cflags dolfinx)
-LDFLAGS  = $(shell pkg-config --libs dolfinx) -Wl,-rpath,$(shell pkg-config --variable=libdir dolfinx)
+LDLIBS   = $(shell pkg-config --libs dolfinx)
+LDFLAGS  = -Wl,-rpath,$(shell pkg-config --variable=libdir dolfinx)
 
-main: main.cpp
-	$(CXX) $(CXXFLAGS) $< -o $@ $(LDFLAGS)
+main.o: main.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+main: main.o
+	$(CXX) $(LDFLAGS) $< -o $@ $(LDLIBS)
 
 run: main
 	mpiexec -np 1 ./main
 
 clean:
-	rm -f main
+	rm -f main main.o
 
 .PHONY: run clean

From 65bce81c37f24ce6c78e3ca8daa6958a5a3f3781 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 20:03:11 +0200
Subject: [PATCH 08/17] Get compiler from pkgconfig

---
 cpp/test/pkgconfig/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpp/test/pkgconfig/Makefile b/cpp/test/pkgconfig/Makefile
index 8daaac6f66..7be00ea9f3 100644
--- a/cpp/test/pkgconfig/Makefile
+++ b/cpp/test/pkgconfig/Makefile
@@ -1,4 +1,4 @@
-CXX      = mpicxx
+CXX      = $(shell pkg-config --variable compiler dolfinx)
 CXXFLAGS = $(shell pkg-config --cflags dolfinx)
 LDLIBS   = $(shell pkg-config --libs dolfinx)
 LDFLAGS  = -Wl,-rpath,$(shell pkg-config --variable=libdir dolfinx)

From 9d6ceaf62434da91822ebb7eff59247a5af21818 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 20:10:31 +0200
Subject: [PATCH 09/17] fix path

---
 .github/workflows/ccpp.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 99c8676a9e..c7054b4935 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -125,7 +125,7 @@ jobs:
           sudo ldconfig
 
       - name: Run pkg-config test (C++)
-        working-directory: cpp/test/pkgconfig-test
+        working-directory: cpp/test/pkgconfig
         run: |
           make
           make run
@@ -229,7 +229,7 @@ jobs:
           cmake --build build
 
       - name: Run pkg-config test (C++)
-        working-directory: cpp/test/pkgconfig-test
+        working-directory: cpp/test/pkgconfig
         run: |
           export PKG_CONFIG_PATH=$PETSC_DIR/$PETSC_ARCH/lib/pkgconfig:$PKG_CONFIG_PATH
           make

From 4e4dee69a836a8659705f32888b42f2711c37768 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 20:33:30 +0200
Subject: [PATCH 10/17] Add SLEPc package config path

---
 .github/workflows/ccpp.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index c7054b4935..b49aef479c 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -231,7 +231,7 @@ jobs:
       - name: Run pkg-config test (C++)
         working-directory: cpp/test/pkgconfig
         run: |
-          export PKG_CONFIG_PATH=$PETSC_DIR/$PETSC_ARCH/lib/pkgconfig:$PKG_CONFIG_PATH
+          export PKG_CONFIG_PATH=$PETSC_DIR/$PETSC_ARCH/lib/pkgconfig:$SLEPC_DIR/$PETSC_ARCH/lib/pkgconfig:$PKG_CONFIG_PATH
           make
           make run
 

From 64a469320aff33eaf0a13c769188576576732f8d Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 22:20:38 +0200
Subject: [PATCH 11/17] Use Basix pkgconfig

---
 cpp/dolfinx/CMakeLists.txt | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/cpp/dolfinx/CMakeLists.txt b/cpp/dolfinx/CMakeLists.txt
index a52f77ac1c..fef9f074eb 100644
--- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -272,6 +272,7 @@ install(
 
 # Define packages that should be required by pkg-config file
 set(PKG_REQUIRES "spdlog")
+list(APPEND PKG_REQUIRES "basix")
 
 if(TARGET PkgConfig::PETSC)
   list(APPEND PKG_REQUIRES ${PETSC_MODULE_NAME})
@@ -365,15 +366,6 @@ foreach(_def ${PKG_DOLFINX_DEFINITIONS})
   set(PKG_DEFINITIONS "${PKG_DEFINITIONS} -D${_def}")
 endforeach()
 
-# Get basix definitions (this is required to propagate Basix definition to the
-# pkg-config file, in the future Basix should create its own basix.pc file, see
-# https://github.com/FEniCS/basix/issues/204)
-get_target_property(
-  PKG_BASIX_DEFINITIONS
-  Basix::basix
-  INTERFACE_COMPILE_DEFINITIONS
-)
-
 foreach(_def ${PKG_BASIX_DEFINITIONS})
   set(PKG_DEFINITIONS "${PKG_DEFINITIONS} -D${_def}")
 endforeach()

From e21c18cf489db7af699dc106f027e0d18f1d6678 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 22:21:19 +0200
Subject: [PATCH 12/17] Use basix pc file

---
 .github/workflows/fenicsx-refs.env | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/fenicsx-refs.env b/.github/workflows/fenicsx-refs.env
index 22c7e44a7e..6bb88a4bfb 100644
--- a/.github/workflows/fenicsx-refs.env
+++ b/.github/workflows/fenicsx-refs.env
@@ -1,5 +1,5 @@
 basix_repository=FEniCS/basix
-basix_ref=main
+basix_ref=jhale/add-pkgconfig
 ufl_repository=FEniCS/ufl
 ufl_ref=main
 ffcx_repository=FEniCS/ffcx

From 9ea2d5d83ff7626ff53b2a5aaff6d1d3c2b8edb1 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 22:25:47 +0200
Subject: [PATCH 13/17] Remove basix hacks

---
 cpp/dolfinx/CMakeLists.txt | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/cpp/dolfinx/CMakeLists.txt b/cpp/dolfinx/CMakeLists.txt
index fef9f074eb..09bc42a486 100644
--- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -366,10 +366,6 @@ foreach(_def ${PKG_DOLFINX_DEFINITIONS})
   set(PKG_DEFINITIONS "${PKG_DEFINITIONS} -D${_def}")
 endforeach()
 
-foreach(_def ${PKG_BASIX_DEFINITIONS})
-  set(PKG_DEFINITIONS "${PKG_DEFINITIONS} -D${_def}")
-endforeach()
-
 # Convert compiler flags and definitions into space separated strings
 string(REPLACE ";" " " PKG_CXXFLAGS "${CMAKE_CXX_FLAGS}")
 get_target_property(_cxx_standard dolfinx CXX_STANDARD)

From 1fa7073b3184a7e5951a6b16e3d06552534b4254 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 22:32:30 +0200
Subject: [PATCH 14/17] Handle ADIOS2

---
 cpp/dolfinx/CMakeLists.txt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/cpp/dolfinx/CMakeLists.txt b/cpp/dolfinx/CMakeLists.txt
index 09bc42a486..30fad2ee4b 100644
--- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -341,6 +341,16 @@ foreach(_target ${PKGCONFIG_DOLFINX_TARGET_LINK_LIBRARIES})
         list(APPEND PKGCONFIG_DOLFINX_LIBS ${_libs})
       endif()
     endif()
+
+    # Special handling for ADIOS2 imported targets which expose
+    # IMPORTED_LOCATION_RELEASE rather than INTERFACE_LINK_LIBRARIES
+    if("${_target}" MATCHES "^.*adios2::.*$")
+      get_target_property(_libs ${_target} IMPORTED_LOCATION_RELEASE)
+
+      if(_libs)
+        list(APPEND PKGCONFIG_DOLFINX_LIBS ${_libs})
+      endif()
+    endif()
   endif()
 endforeach()
 

From f83f1b0225933796efb2a342052a74e45d9d01fa Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 22:40:05 +0200
Subject: [PATCH 15/17] Fix HDF5 and ADIOS2

---
 cpp/dolfinx/CMakeLists.txt | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/cpp/dolfinx/CMakeLists.txt b/cpp/dolfinx/CMakeLists.txt
index 30fad2ee4b..5c2e8ce115 100644
--- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -342,11 +342,16 @@ foreach(_target ${PKGCONFIG_DOLFINX_TARGET_LINK_LIBRARIES})
       endif()
     endif()
 
-    # Special handling for ADIOS2 imported targets which expose
-    # IMPORTED_LOCATION_RELEASE rather than INTERFACE_LINK_LIBRARIES
-    if("${_target}" MATCHES "^.*adios2::.*$")
+    # Special handling for ADIOS2 and HDF5 imported targets which expose
+    # IMPORTED_LOCATION_RELEASE (or IMPORTED_LOCATION) rather than
+    # INTERFACE_LINK_LIBRARIES
+    if("${_target}" MATCHES "^.*adios2::.*$" OR "${_target}" MATCHES "^.*hdf5::.*$")
       get_target_property(_libs ${_target} IMPORTED_LOCATION_RELEASE)
 
+      if(NOT _libs)
+        get_target_property(_libs ${_target} IMPORTED_LOCATION)
+      endif()
+
       if(_libs)
         list(APPEND PKGCONFIG_DOLFINX_LIBS ${_libs})
       endif()

From f8e199912bb10d241e213950bedb0125e56fc152 Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 22:43:16 +0200
Subject: [PATCH 16/17] Add pugixml

---
 cpp/dolfinx/CMakeLists.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cpp/dolfinx/CMakeLists.txt b/cpp/dolfinx/CMakeLists.txt
index 5c2e8ce115..f37ddb63b2 100644
--- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -273,6 +273,7 @@ install(
 # Define packages that should be required by pkg-config file
 set(PKG_REQUIRES "spdlog")
 list(APPEND PKG_REQUIRES "basix")
+list(APPEND PKG_REQUIRES "pugixml")
 
 if(TARGET PkgConfig::PETSC)
   list(APPEND PKG_REQUIRES ${PETSC_MODULE_NAME})

From ea62e2edb9d1aeea83c5e8ca1e78c40ef94fd34a Mon Sep 17 00:00:00 2001
From: "Jack S. Hale" <mail@jackhale.co.uk>
Date: Thu, 9 Jul 2026 22:53:12 +0200
Subject: [PATCH 17/17] Fix

---
 cpp/dolfinx/CMakeLists.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cpp/dolfinx/CMakeLists.txt b/cpp/dolfinx/CMakeLists.txt
index f37ddb63b2..1831a31b79 100644
--- a/cpp/dolfinx/CMakeLists.txt
+++ b/cpp/dolfinx/CMakeLists.txt
@@ -346,7 +346,10 @@ foreach(_target ${PKGCONFIG_DOLFINX_TARGET_LINK_LIBRARIES})
     # Special handling for ADIOS2 and HDF5 imported targets which expose
     # IMPORTED_LOCATION_RELEASE (or IMPORTED_LOCATION) rather than
     # INTERFACE_LINK_LIBRARIES
-    if("${_target}" MATCHES "^.*adios2::.*$" OR "${_target}" MATCHES "^.*hdf5::.*$")
+    if(
+      "${_target}" MATCHES "^.*adios2::.*$"
+      OR "${_target}" MATCHES "^.*hdf5::.*$"
+    )
       get_target_property(_libs ${_target} IMPORTED_LOCATION_RELEASE)
 
       if(NOT _libs)