https://codeload.github.com/Reference-LAPACK/lapack/tar.gz/v3.9.0

F90-S-0126-Name etime is not an intrinsic function (../INSTALL/second_INT_ETIME.f: 53) 

  0 inform,   0 warnings,   1 severes, 0 fatal for second 

make[1]: *** [<builtin>: ../INSTALL/second_INT_ETIME.o] Error 1 

make[1]: Leaving directory 'path/to/lapack/lapack-3.9.0/SRC' 

make: *** [Makefile:27: lapacklib] Error 2

--- make.inc        2023-09-05 19:07:47.290373140 +0800
+++ make.inc    2023-09-05 15:13:02.494373140 +0800
@@ -8,8 +8,8 @@ SHELL = /bin/sh

 #  CC is the C compiler, normally invoked with options CFLAGS.
 #
-CC = gcc
-CFLAGS = -O3
+CC = clang
+CFLAGS = -O3 -march=native

 #  Modify the FC and FFLAGS definitions to the desired compiler
 #  and desired compiler options for your machine.  NOOPT refers to
@@ -19,10 +19,10 @@ CFLAGS = -O3
 #  and handle these quantities appropriately. As a consequence, one
 #  should not compile LAPACK with flags such as -ffpe-trap=overflow.
 #
-FC = gfortran
-FFLAGS = -O2 -frecursive
+FC = flang
+FFLAGS = -O2
 FFLAGS_DRV = $(FFLAGS)
-FFLAGS_NOOPT = -O0 -frecursive
+FFLAGS_NOOPT = -O0

 #  Define LDFLAGS to the desired linker options for your machine.
 #
@@ -45,11 +45,11 @@ RANLIB = ranlib
 #TIMER = EXT_ETIME_
 #  For gfortran compiler:  SECOND and DSECND will use a call to the
 #  INTERNAL FUNCTION ETIME
-TIMER = INT_ETIME
+#TIMER = INT_ETIME
 #  If your Fortran compiler does not provide etime (like Nag Fortran
 #  Compiler, etc...) SECOND and DSECND will use a call to the
 #  INTERNAL FUNCTION CPU_TIME
-#TIMER = INT_CPU_TIME
+TIMER = INT_CPU_TIME
 #  If none of these work, you can use the NONE value.
 #  In that case, SECOND and DSECND will always return 0.
 #TIMER = NONE