diff --git a/.gitignore b/.gitignore
index f81675c..9fcd6a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-build/
+build*/
 .spack-env/
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9216cc9..2b827b6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.31.1)
+cmake_minimum_required(VERSION 3.16)
 
 # Enable compile_commands.json generation for IDE support
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
@@ -15,16 +15,28 @@ find_package(PkgConfig REQUIRED)
 
 pkg_search_module(OpenBLAS REQUIRED IMPORTED_TARGET openblas)
 pkg_search_module(PETSc REQUIRED IMPORTED_TARGET petsc)
+pkg_search_module(hdf5 REQUIRED IMPORTED_TARGET hdf5)
 pkg_search_module(OpenMPI REQUIRED IMPORTED_TARGET ompi)
 
-add_executable(main main.c)
-target_include_directories(main PUBLIC ${PETSc_INCLUDE_DIRS} ${OpenBLAS_INCLUDE_DIRS} ${OpenMPI_INCLUDE_DIRS})
-target_link_libraries(main PUBLIC m PkgConfig::PETSc PkgConfig::OpenBLAS PkgConfig::OpenMPI)
+# add_executable(main main.c)
+# target_include_directories(main PUBLIC ${PETSc_INCLUDE_DIRS} ${OpenBLAS_INCLUDE_DIRS} ${OpenMPI_INCLUDE_DIRS})
+# target_link_libraries(main PUBLIC m PkgConfig::PETSc PkgConfig::OpenBLAS PkgConfig::OpenMPI)
 
 add_executable(arnoldi arnoldi.c)
-target_include_directories(arnoldi PUBLIC ${PETSc_INCLUDE_DIRS} ${OpenBLAS_INCLUDE_DIRS} ${OpenMPI_INCLUDE_DIRS})
-target_link_libraries(arnoldi PUBLIC m PkgConfig::PETSc PkgConfig::OpenBLAS PkgConfig::OpenMPI)
-
-add_executable(ex10 ex10.c)
-target_include_directories(ex10 PUBLIC ${PETSc_INCLUDE_DIRS} ${OpenBLAS_INCLUDE_DIRS} ${OpenMPI_INCLUDE_DIRS})
-target_link_libraries(ex10 PUBLIC m PkgConfig::PETSc PkgConfig::OpenBLAS PkgConfig::OpenMPI)
+target_include_directories(arnoldi PUBLIC 
+    ${PETSc_INCLUDE_DIRS}
+    ${hdf5_INCLUDE_DIRS}
+    ${OpenBLAS_INCLUDE_DIRS}
+    ${OpenMPI_INCLUDE_DIRS}
+)
+target_link_libraries(arnoldi PUBLIC 
+    m
+    PkgConfig::PETSc
+    PkgConfig::hdf5
+    PkgConfig::OpenBLAS
+    PkgConfig::OpenMPI
+)
+
+# add_executable(ex10 ex10.c)
+# target_include_directories(ex10 PUBLIC ${PETSc_INCLUDE_DIRS} ${OpenBLAS_INCLUDE_DIRS} ${OpenMPI_INCLUDE_DIRS})
+# target_link_libraries(ex10 PUBLIC m PkgConfig::PETSc PkgConfig::OpenBLAS PkgConfig::OpenMPI)