fix linker errors: add HDF5 C++ lib and FFTW3 include paths

- Add ${HDF5_LIBRARIES} to PMusr link dependencies so HDF5 C++ symbols
  (H5::DataType, H5::PredType, etc.) used in PRunDataHandler.cpp resolve.
- Add ${FFTW3_INCLUDE} to musrRootValidation and write_musrRoot_runHeader
  include paths; both pull in PMusr.h which transitively includes fftw3.h.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/CMakeLists.txt

@@ -106,11 +106,12 @@ target_link_libraries(musrFT  FFTW3::FFTW3 ${ROOT_LIBRARIES} ${MUSRFIT_LIBS})
 
 add_executable(musrRootValidation musrRootValidation.cpp)
 target_compile_options(musrRootValidation BEFORE PRIVATE "-DHAVE_CONFIG_H" "${HAVE_GIT_REV_H}")
-target_include_directories(musrRootValidation 
+target_include_directories(musrRootValidation
   BEFORE PRIVATE
     $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
     $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/src>
     $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/src/include>
+    $<BUILD_INTERFACE:${FFTW3_INCLUDE}>
     $<BUILD_INTERFACE:${LIBXML2_INCLUDE_DIR}>
 )
 target_link_libraries(musrRootValidation ${ROOT_LIBRARIES} ${MUSRFIT_LIBS} ${LIBXML2_LIBRARIES})
@@ -140,11 +141,12 @@ target_link_libraries(musrview FFTW3::FFTW3 ${ROOT_LIBRARIES} ${MUSRFIT_LIBS})
 
 add_executable(write_musrRoot_runHeader write_musrRoot_runHeader.cpp)
 target_compile_options(write_musrRoot_runHeader BEFORE PRIVATE "-DHAVE_CONFIG_H" "${HAVE_GIT_REV_H}")
-target_include_directories(write_musrRoot_runHeader 
+target_include_directories(write_musrRoot_runHeader
   BEFORE PRIVATE
     $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
     $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/src>
     $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/src/include>
+    $<BUILD_INTERFACE:${FFTW3_INCLUDE}>
     $<BUILD_INTERFACE:${LIBXML2_INCLUDE_DIR}>
     $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/src/external/MusrRoot>
 )

src/classes/CMakeLists.txt

@@ -196,6 +196,7 @@ set(DependOnLibs ${DependOnLibs} Class_MuSR_PSI)
 if (nexus)
   set(DependOnLibs ${DependOnLibs} ${LIBNEXUS_LIBRARY})
   set(DependOnLibs ${DependOnLibs} PNeXus)
+  set(DependOnLibs ${DependOnLibs} ${HDF5_LIBRARIES})
 endif (nexus)
 if (OpenMP_FOUND)
   set(DependOnLibs ${DependOnLibs} OpenMP::OpenMP_CXX)