fix

Author: Jean-Romain

src/LAS_point_metrics.cpp

@@ -1,6 +1,9 @@
 #include "LAS.h"
+#include "Progress.h"
 #include "SpatialIndex.h"
 
+using namespace lidR;
+
 // From data.table https://github.com/Rdatatable/data.table/pull/7451/changes
 #if R_VERSION < R_Version(4, 6, 0) || R_SVN_REVISION < 89077
 # define BACKPORT_RESIZABLE_API

src/Makevars

@@ -8,6 +8,7 @@ SOURCES = ./Progress.cpp \
 ./C_ptd.cpp \
 ./C_chm_prep.cpp \
 ./LAS.cpp \
+./LAS_point_metrics.cpp \
 ./knn.cpp \
 ./C_Gatziolis2019.cpp \
 ./RcppFunction.cpp \