$ ls CEU*.vcf.gz | xargs vcf-merge >CEUmerge.vcf
Use of qw(...) as parentheses is deprecated at /opt/vcftools_0.1.9/perl//Vcf.pm line 1622.
Broken VCF header, no column names?
 at /opt/vcftools_0.1.9/perl//Vcf.pm line 177
	Vcf::throw('Vcf4_1=HASH(0x1da3d30)', 'Broken VCF header, no column names?') called at /opt/vcftools_0.1.9/perl//Vcf.pm line 868
	VcfReader::_read_column_names('Vcf4_1=HASH(0x1da3d30)') called at /opt/vcftools_0.1.9/perl//Vcf.pm line 610
	VcfReader::parse_header('Vcf4_1=HASH(0x1da3d30)') called at /usr/local/bin/vcf-merge line 168
	main::init_cols('HASH(0x1d9ff80)', 'Vcf4_1=HASH(0x1da3478)') called at /usr/local/bin/vcf-merge line 264
	main::merge_vcf_files('HASH(0x1d9ff80)') called at /usr/local/bin/vcf-merge line 12